C508_01 Datasheet, PDF (14/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
Introduction
1.2
Pin Definitions and Functions
This section describes all external signals of the C508 and their functions.
Table 1-1 Pin Definitions and Functions
Symbol
Pin Numbers
I/O¹⁾ Function
P-MQFP-64 P-SDIP-64
P1.0-P1.7 32 - 25
32
31
30
29
28
27
26
25
40 - 33
40
39
38
37
36
35
34
33
I/O Port 1
is an 8-bit quasi-bidirectional port with internal pull-
up transistors. Port 1 pins can be used for digital
input/output. Port 1 pins that have 1’s written to
them are pulled high by the internal pull-up
transistors and in that state can be used as inputs.
As inputs, Port 1 pins being externally pulled low will
source current (I_IL, in the DC characteristics)
because of the internal pull-up transistors. The
output latch corresponding secondary function must
be programmed to a one (1) for that function to
operate. As secondary functions, Port 1 contains
the capture/compare inputs/outputs as well as the
CCU trap input.
Port 1 pins have LED drive capability of up to 10 mA
sinking current per pin.
The secondary functions from the CCU unit are
assigned to the pins of Port 1 as follows:
P1.0 / COUT3 10-bit compare channel output
P1.1 / CTRAP CCU trap input
P1.2 / CC0 Input/Output of capture/compare
Channel 0
P1.3 / COUT0 Output of capture/compare
Channel 0
P1.4 / CC1 Input/Output of capture/compare
Channel 1
P1.5 / COUT1 Output of capture/compare
Channel 1
P1.6 / CC2 Input/Output of capture/compare
Channel 2
P1.7 / COUT2 Output of capture/compare
Channel 2
RESET 1
9
I RESET
A high level on this pin for one machine cycle while
the oscillator is running resets the device. An
internal diffused resistor to V_SS permits power-on
reset using only an external capacitor to V_DD.
User’s Manual
1-6
2001-05