SN8P2501B
8-Bit Micro-Controller
4.5
系统低速时钟.................................................................................................................................................................... 45
系统时钟测试............................................................................................................................................................... 45
4.5.1
5
5
5
系统工作模式............................................................................................................................................................................. 46
概述.................................................................................................................................................................................. 46
模式切换举例.................................................................................................................................................................... 47
唤醒时间........................................................................................................................................................................... 48
5.1
5.2
5.3
5.3.1
5.3.2
5.3.3
概述............................................................................................................................................................................. 48
唤醒时间...................................................................................................................................................................... 48
P1W 唤醒控制寄存器................................................................................................................................................... 48
6
6
6
中断........................................................................................................................................................................................... 49
概述.................................................................................................................................................................................. 49
中断请求使能寄存器INTEN ............................................................................................................................................. 49
中断请求寄存器INTRQ.................................................................................................................................................... 50
GIE 全局中断.................................................................................................................................................................... 50
PUSH, POP 处理.............................................................................................................................................................. 51
INT0(P0.0)中断................................................................................................................................................................ 52
T0 中断............................................................................................................................................................................. 53
TC0 中断.......................................................................................................................................................................... 54
多中断操作举例................................................................................................................................................................ 55
定时器........................................................................................................................................................................................ 56
看门狗定时器.................................................................................................................................................................... 56
定时器T0 ......................................................................................................................................................................... 57
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
7
7
7
7.1
7.2
7.2.1
7.2.2
7.2.3
7.2.4
概述............................................................................................................................................................................. 57
模式寄存器T0M .......................................................................................................................................................... 58
计数寄存器T0C........................................................................................................................................................... 59
T0 操作时序................................................................................................................................................................. 60
定时/计数器TC0 .............................................................................................................................................................. 61
概述............................................................................................................................................................................. 61
模式寄存器TC0M........................................................................................................................................................ 62
计数寄存器TC0C ........................................................................................................................................................ 63
自动重载寄存器TC0R................................................................................................................................................. 64
TC0 时钟频率输出(蜂鸣器输出)................................................................................................................................... 65
TC0 操作举例.............................................................................................................................................................. 66
PWM0 .............................................................................................................................................................................. 67
概述............................................................................................................................................................................. 67
TC0IRQ 和PWM 输出占空比...................................................................................................................................... 68
PWM 输出占空比与TC0R 的变化...............................................................................................................................69
PWM 编程举例............................................................................................................................................................ 70
7.3
7.3.1
7.3.2
7.3.3
7.3.4
7.3.5
7.3.6
7.4
7.4.1
7.4.2
7.4.3
7.4.4
8
8
8
I/O 端口...................................................................................................................................................................................... 71
I/O 端口模式..................................................................................................................................................................... 71
I/O 口上拉电阻................................................................................................................................................................. 72
I/O 漏极开路寄存器.......................................................................................................................................................... 73
I/O 口数据寄存器.............................................................................................................................................................. 74
指令表........................................................................................................................................................................................ 75
电气特性.................................................................................................................................................................................... 75
OTP 烧录引脚............................................................................................................................................................................ 77
8.1
8.2
8.3
8.4
9
9
9
10
10
10
11
11
11
11.1
11.2
转接板插座对应的引脚分布图...................................................................................................................................... 77
烧录引脚分布图........................................................................................................................................................... 78
12
12
12
13
13
13
SN8P2501A 升级为SN8P2501B 注意事项................................................................................................................................ 79
封装信息.................................................................................................................................................................................... 81
13.1
13.2
13.3
P-DIP 14 PIN ............................................................................................................................................................... 81
SOP 14 PIN ................................................................................................................................................................. 82
SSOP 16 PIN............................................................................................................................................................... 83
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