P89C738ABB Просмотр технического описания (PDF) - Philips Electronics

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Компоненты Описание

производитель

P89C738ABB

8-bit Flash microcontrollers

Philips Electronics 

SYMBOL

P4.0 to P4.7

P5.0 to P5.7

n.c.

PIN(1)

PLCC68 QFP64

20, 24,

26, 44,

46, 50, 53

and 57

12, 16,

18, 34,

36, 40, 43

and 47

60, 62,

63, 7, 8,

10, 13

and 16

50, 52,

53, 63,

64, 2, 5

and 8

1, 4, 18, 23, 24,

31, 32, 25, 27,

33, 35, 28, 42

36, 37, 38 and 58

52 and 66

PLCC44

n.a.(3)

n.a.

6, 17, 28

and 39

QFP44

n.a.

n.a.

1, 12, 23

and 34

DIP40

n.a.

n.a.

n.a.

DESCRIPTION

Port 4: P4.0 to P4.7; 8-bit quasi-bidirectional I/O port with internal

pull-ups. Port 4 can sink/source 4 LSTTL inputs. It can drive CMOS

inputs without external pull-ups.

Port 5: P5.0 to P5.7; 8-bit quasi-bidirectional I/O port with internal

pull-ups. Port 5 can sink/source 4 LSTTL inputs. It can drive CMOS

inputs without external pull-ups.

Not connected.

Notes

1. To avoid a ‘latch-up’ effect at power-on, the voltage on any pin (at any time) must not be higher than VDD + 0.5 V or lower than VSS − 0.5 V

respectively.

2. To prohibit the toggling of the ALE/WE pin (RFI noise reduction) the bit RFI in the PCON register (PCON.5) must be set by software. This bit is

cleared on reset and can be cleared by software. When set, ALE/WE pin will be pulled down internally, switching an external address latch to a

quiet state. The MOVX instruction will still toggle ALE/WE as a normal MOVX. ALE/WE will retain its normal HIGH value during Idle mode and a

LOW value during Power-down mode while in the ‘RFI’ mode. Additionally during internal access (EA = 1) ALE/WE will toggle normally when the

address exceeds the internal program memory size. During external access (EA = 0) ALE/WE will always toggle normally, whether the flag ‘RFI’ is

set or not.

3. n.a. = not applicable.

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