P80C562 Philips Semiconductors, P80C562 Datasheet - Page 8

• Manufacturer Part Number: P80C562
• Description: 8-bit microcontroller
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1997 Apr 08
XTAL1
V
n.c.
P2.0/A08
to
P2.7/A15
PSEN
ALE
EA
P0.7/AD7
to
P0.0/AD0
AV
AV
AV
AV
P5.7/ADC7
to
P5.0/ADC0
SS
8-bit microcontroller
REF-
REF+
SS
DD
SYMBOL
62 to 68,
39 to 46
50 to 57
36, 37
PIN
35
38
47
48
49
58
59
60
61
1
Crystal Oscillator Input: input to the inverting amplifier that forms the oscillator, and
input to the internal clock generator. Receives the external oscillator clock signal when
an external oscillator is used.
Digital ground pins.
Not connected.
P2.0 to P2.7: 8-bit quasi-bidirectional I/O port lines;
A08 to A15: High-order address byte for external memory.
Program Store Enable: read strobe to the external program memory via Port 0 and 2.
Is activated twice each machine cycle during fetches from external program memory.
When executing out of external program memory two activations of PSEN are skipped
during each access to external data memory. PSEN is not activated (remains HIGH)
during no fetches from external program memory. PSEN can sink/source 8 LSTTL
inputs and can drive CMOS inputs without external pull-ups.
Address Latch Enable: latches the low byte of the address during access of external
memory in normal operation. It is activated every six oscillator periods except during an
external data memory access. ALE can sink/source 8 LSTTL inputs and can drive
CMOS inputs without an external pull-up. To prohibit the toggling of the ALE pin (RFI
noise reduction) the RFI bit in the Power Control Register must be set by software.
External Access: if, during RESET, EA is HIGH the CPU executes out of the internal
program memory provided the program Counter is less than 8192. If, during RESET,
EA is LOW the CPU executes out of external program memory via Port 0 and Port 2.
EA is not allowed to float. EA is latched during RESET and don’t care after RESET.
P0.7 to P0.0: 8-bit open drain bidirectional I/O port lines;
AD7 to AD0: Multiplexed Low-order address and Data bus for external memory.
Low-end of ADC (analog-to-digital conversion) reference resistor.
High-end of ADC (analog-to-digital conversion) reference resistor.
Ground, analog part. For ADC receiver and reference voltage.
Power supply, analog part (+5 V). For ADC receiver and reference voltage.
P5.7 to P5.0: 8-bit input port lines;
ADC7 to ADC0: eight analog ADC inputs
8
DESCRIPTION
P83C562; P80C562
Product specification