C508 datasheet(13/93 Pages) INFINEON

13 / 93 page

C508

Data Sheet

2000-08

P4.0-

P4.7

5 - 12

13 - 20

Port 4

is an 8-bit uni-directional input port to the A/D

converter. Port pins can be used for digital

input, if voltage levels simultaneously meet the

specifications for high/low input voltages and

for the eight multiplexed analog inputs.

PSEN

The Program Strobe Enable

output is a control signal that enables the

external program memory to the bus during

external fetch operations. It is activated every

one and a half oscillator periods except during

external data memory accesses. Remains high

during internal program execution. This pin

should not be driven during reset operation.

ALE

The Address Latch Enable

output is used for latching the low-byte of the

address into external memory during normal

operation. It is activated every one and a half

oscillator periods except during an external

data memory access. When instructions are

executed from internal ROM (EA = 1) the ALE

generation can be disabled by bit EALE in SFR

SYSCON. This pin should not be driven during

reset operation.

210

External Access Enable

When held at high level, instructions are

fetched from the internal ROM when the PC is

less than 8000H. When held at low level, the

C508 fetches all instructions from external

program memory. This pin should not be driven

during reset operation.

Table 1

Pin Defintions and Functions (cont’d)

Sym-

bol

Pin Numbers

I/O1) Function

P-MQFP-64 P-SDIP-64

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