Datasheet > 89C55

89C55

更新时间： 2024-02-03 16:15:41

品牌	Logo	应用领域
爱特美尔 - ATMEL		闪存微控制器
页数	文件大小	规格书
24页	608K
描述
8-Bit Microcontroller with 20K Bytes Flash

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数据手册

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89C55 数据手册

Table 2. T2CON—Timer/Counter 2 Control Register

T2CON Address = 0C8H

Reset Value = 0000 0000B

Bit Addressable

TF2

EXF2

RCLK

TCLK

EXEN2

TR2

C/T2

CP/RL2

Bit

Symbol

Function

TF2

Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software. TF2 will not be set when either RCLK

= 1 or TCLK = 1.

EXF2

Timer 2 external flag set when either a capture or reload is caused by a negative transition on T2EX and EXEN2 = 1.

When Timer 2 interrupt is enabled, EXF2 = 1 will cause the CPU to vector to the Timer 2 interrupt routine. EXF2 must

be cleared by software. EXF2 does not cause an interrupt in up/down counter mode (DCEN = 1).

RCLK

TCLK

Receive clock enable. When set, causes the serial port to use Timer 2 overflow pulses for its receive clock in serial port

Modes 1 and 3. RCLK = 0 causes Timer 1 overflow to be used for the receive clock.

Transmit clock enable. When set, causes the serial port to use Timer 2 overflow pulses for its transmit clock in serial

port Modes 1 and 3. TCLK = 0 causes Timer 1 overflows to be used for the transmit clock.

EXEN2

Timer 2 external enable. When set, allows a capture or reload to occur as a result of a negative transition on T2EX if

Timer 2 is not being used to clock the serial port. EXEN2 = 0 causes Timer 2 to ignore events at T2EX.

TR2

Start/Stop control for Timer 2. TR2 = 1 starts the timer.

C/T2

Timer or counter select for Timer 2. C/T2 = 0 for timer function. C/T2 = 1 for external event counter (falling edge

triggered).

CP/RL2

Capture/Reload select. CP/RL2 = 1 causes captures to occur on negative transitions at T2EX if EXEN2 = 1. CP/RL2 =

0 causes automatic reloads to occur when Timer 2 overflows or negative transitions occur at T2EX when EXEN2 = 1.

When either RCLK or TCLK = 1, this bit is ignored and the timer is forced to auto-reload on Timer 2 overflow.

AT89C55

4-174

1...3 4 567 8 9...24

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