Datasheet > 87C575

87C575

更新时间： 2022-12-11 19:23:06

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
40页	386K
描述
80C51 8-bit microcontroller family 8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

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87C575 数据手册

Philips Semiconductors

Product specification

80C51 8-bit microcontroller family

8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

80C575/83C575/

87C575

PIN DESCRIPTIONS (Continued)

PIN NUMBER

MNEMONIC

DIP

LCC

QFP TYPE NAME AND FUNCTION

Port 3: (continued)

P3.0 RxD

P3.1 TxD

P3.2 INT0

P3.3 INT1

P3.4 T0

Serial receive port

Serial transmit port enabled only when transmitting serial data

External interrupt 0

External interrupt 1

Timer/counter 0 input

CMPR- Common - reference to comparators 1, 2, 3

P3.5 T1

Timer/counter 1 input

CMP1+ Comparator 1 positive input

P3.6 WR

CMP2+ Comparator 2 positive input

P3.7 RD

External data memory write strobe

External data memory read strobe

CMP3+ Comparator 3 positive input

RST

Reset: A low on this pin asynchronously resets all port pins to a low state except P3.1. The

pin must be held low with the oscillator running for 24 oscillator cycles to initialize the

internal registers. An internal diffused resistor to V permits a power on reset using only

an external capacitor to V . RST has a Schmitt trigger input stage to provide additional

noise immunity with a slow rising input voltage.

ALE/PROG

I/O

Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the

address during an access to external memory. In normal operation, ALE is emitted at a

constant rate of 1/6 the oscillator frequency, and can be used for external timing or clocking.

Note that one ALE pulse is skipped during each access to external data memory. ALE is

switched off if the bit 0 in the AUXR register (8EH) is set. This pin is also the program pulse

input (PROG) during EPROM programming.

PSEN

Program Store Enable: The read strobe to external program memory. When the device is

executing code from the external program memory, PSEN is activated twice each machine

cycle, except that two PSEN activations are skipped during each access to external data

memory. PSEN is not activated during fetches from internal program memory.

EA/V

External Access Enable/Programming Supply Voltage: EA must be externally held low

to enable the device to fetch code from external program memory locations 0000H to

1FFFH. If EA is held high, the device executes from internal program memory unless the

program counter contains an address greater than 1FFFH. This pin also receives the

12.75V programming supply voltage (V ) during EPROM programming.

XTAL1

XTAL2

Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator

circuits.

Crystal 2: Output from the inverting oscillator amplifier.

1998 May 01

1...3 4 567 8 9...40

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与87C575相关器件

型号	品牌	描述	获取价格	数据表
87C576	NXP	80C51 8-bit microcontroller family 8K/256 OTP/ROM, 6 channel 10-bit A/D, 4 comparators, fa	获取价格
87C58	NXP	80C51 8-bit microcontroller family 8K.64K/256.1K OTP/ROM/ROMless, low voltage 2.7V.5.5V, l	获取价格
87C58	INTEL	CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER	获取价格
87C58X2	NXP	80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to	获取价格
87C652	NXP	80C51 8-bit microcontroller 8K/16K, 256 OTP, I2C	获取价格
87C654	NXP	CMOS single-chip 8-bit microcontroller	获取价格

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