C508 datasheet(14/93 Pages) INFINEON

14 / 93 page

C508

Data Sheet

2000-08

P0.0-

P0.7

57 - 64

1 - 8

I/O

Port 0

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

0 pins that have “1”s written to them float, and

in that state can be used as high-impedance

inputs. Port 0 is also the multiplexed low-order

address and data bus during accesses to

external program or data memory. In this

application it uses strong internal pullup

transistors when issuing “1”s.

Port 0 also outputs the code bytes during

program verification in the C508-4R. External

pullup resistors are required during program

verification.

P5.0-

P5.7

15 - 22

23 - 30

I/O

Port 5

is a an 8-bit quasi-bidirectional I/O port with

internal pullup transistors. Port 5 pins that have

“1”s written to them are pulled high by the

internal pullup resistors, and in that state can

be used as inputs. As inputs, Port 5 pins being

externally pulled low will source current (

IIL, in

the DC characteristics) because of the internal

pullup transistors.

As secondary functions, Port 5 contains the

interrupt and Timer 2 capture/compare pins.

They are assigned to the pins as follows:

P5.0/T2CC0/INT3 T2 Compare/Capture

output 0/Interrupt 3 input

P5.1/T2CC1/INT4 T2 Compare/Capture

output 1/Interrupt 4 input

P5.2/T2CC2/INT5 T2 Compare/Capture

output 2/Interrupt 5 input

P5.3/T2CC3/INT6 T2 Compare/Capture

output 3/Interrupt 6 input

P5.4/INT2

Interrupt 2 input

P5.5/INT9

Interrupt 9 input

P5.6/INT8

Interrupt 8 input

P5.7/INT7

Interrupt 7 input

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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