C517A_99 Datasheet, PDF (13/218 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Introduction
C517A
Table 1-1
Pin Definitions and Functions
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P1.0 - P1.7
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9 - 6, 1,
100 - 98
36 - 29
9
36
8
35
7
34
6
33
1
32
100
31
99
30
98
29
*) I = Input,
O = Output
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I/O Port 1
is an 8-bit quasi-bidirectional I/O port with
internal pullup resistors. Port 1 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 1 pins
being externally pulled low will source
current (I _IL, in the DC characteristics)
because of the internal pullup resistors. The
port is used for the low-order address byte
during program verification. Port 1 also
contains the interrupt, timer, clock, capture
and compare pins that are used by various
options. The output latch corresponding to a
secondary function must be programmed to
a one (1) for that function to operate (except
when used for the compare functions). The
secondary functions are assigned to the port
1 pins as follows :
P1.0 / INT3 / CC0 Interrupt 3 input /
compare 0 output /
capture 0 input
P1.1 / INT4 / CC1 Interrupt 4 input /
compare 1 output /
capture 1 input
P1.2 / INT5 / CC2 Interrupt 5 input /
compare 2 output /
capture 2 input
P1.3 / INT6 / CC3 Interrupt 6 input /
compare 3 output /
capture 3 input
P1.4 / INT2 / CC4 Interrupt 2 input /
compare 4 output /
capture 4 input
P1.5 / T2EX
Timer 2 external
reload / trigger input
P1.6 / CLKOUT System clock output
P1.7 / T2
Counter 2 input
Semiconductor Group
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