IC89C52A-12PQ datasheet(5/22 Pages) ICSI

Part #	IC89C52A-12PQ

Description	CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8(4)-Kbytes of FLASH

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Manufacturer	ICSI [Integrated Circuit Solution Inc]

Direct Link	http://www.icsi.com.tw

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IC89C52(51)A

Integrated CircuitSolution Inc.

5

MC008-0C 11/27/2001

Table 1. Detailed Pin Description

Symbol

PDIP

PLCC

PQFP

I/O

Name and Function

ALE/

PROG

30

33

27

I/O

Address Latch Enable: Output pulse for latching the low byte

of the address during an address to the 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. This pin is also the Program

Pulse input (

PROG) during Flash programming.

EA/VPP

31

35

29

I

External Access enable:

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 also

receives the 12V programming enable voltage (VPP) during

Flash programming.

P0.0-P0.7

39-32

43-36

37-30

I/O

Port 0: Port 0 is an 8-bit open-drain, bidirectional I/O port. Port

0 pins that have 1s written to them float and can be used as high-

impedance inputs. Port 0 is also the multiplexed low-order

address and data bus during accesses to external program and

data memory. In this application, it uses strong internal pullups

when emitting 1s.

Port 0 also receives the command and code bytes during

programmable memory programming and outputs the code

bytes during program verification. External pullups are required

during program verification.

P1.0-P1.7

1-8

2-9

40-44

I/O

Port 1: Port 1 is an 8-bit bidirectional I/O port with internal

1-3

pullups. Port 1 pins that have 1s written to them are pulled high

by the internal pullups and can be used as inputs. As inputs, Port

1 pins that are externally pulled low will source current because

of the internal pullups. (See DC Characteristics: IIL). The Port 1

output buffers can sink/source four TTL inputs.

Port 1 also receives the low-order address byte during Flash

programming and verification.

12

40

I

T2(P1.0): Timer/Counter 2 external count input.(IC89C52A

only)

23

41

I

T2EX(P1.1): Timer/Counter 2 trigger input.(IC89C52A only)

P2.0-P2.7

21-28

24-31

18-25

I/O

Port 2: Port 2 is an 8-bit bidirectional I/O port with internal

pullups. Port 2 pins that have 1s written to them are pulled high

by the internal pullups and can be used as inputs. As inputs, Port

2 pins that are externally pulled low will source current because

of the internal pullups. (See DC Characteristics: IIL). Port 2 emits

the high order address byte during fetches from external pro-

gram memory and during accesses to external data memory

that used 16-bit addresses (MOVX @ DPTR). In this application,

Port 2 uses strong internal pullups when emitting 1s. During

accesses to external data memory that use 8-bit addresses

(MOVX @ Ri [i = 0, 1]), Port 2 emits the contents of the P2

Special Function Register.

Port 2 also receives the high-order bits and some control signals

during Flash programming and verification. P2.6 and P2.7 are

the control signals while the chip programs and erases.

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