SAB80C517A-N18 Siemens Semiconductor Group, SAB80C517A-N18 Datasheet - Page 11

• Manufacturer Part Number: SAB80C517A-N18
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: Siemens Semiconductor Group

Pin Definitions and Functions (cont’d)
Symbol
P1.7 - P1.0 29 - 36
*
Semiconductor Group
I = Input
O = Output
P-LCC-84
Pin Number
P-MQFP-100-2
98 - 100,
1, 6 - 9
I/O
I/O
10
*)
Function
Port 1
is a bidirectional I/O port with internal
pull-up resistors. Port 1 pins that have
1 s written to them are pulled high by the
internal pull-up resistors, and in that state
can be used as inputs. As inputs, port 1
pins being externally pulled low will source
current (I
because of the internal pull-up resistors. It
is used for the low order address byte
during program verification. It also contains
the interrupt, timer, clock, capture and
compare pins that are used by various
options. The output latch 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:
– INT3/CC0 (P1.0): interrupt 3 input/
– INT4/CC1 (P1.1): interrupt 4 input /
– INT5/CC2 (P1.2): interrupt 5 input /
– INT6/CC3 (P1.3): interrupt 6 input /
– INT2/CC4 (P1.4): interrupt 2 input /
– T2EX (P1.5):
– CLKOUT (P1.6):
– T2 (P1.7):
compare 0 output /capture 0 input
compare 1 output /capture 1 input
compare 2 output /capture 2 input
compare 3 output /capture 3 input
compare 4 output /capture 4 input
reload trigger input
IL
SAB 80C517A/83C517A-5
, in the DC characteristics)
timer 2 external
system clock output
counter 2 input
1994-05-01