SAB80C515A-5 Datasheet, PDF (60/108 Pages) Siemens Semiconductor Group – 8-Bit CMOS Single-Chip Microcontroller Family

SAB 80C515A/83C515A-5
Pin Definitions and Functions (cont’d)
Symbol Pin
Pin
Input (I) Function
P-LCC-68 P-MQFP-80 Output (O)
P1.7 -
29-36
24-31
I/O
P1.0
XTAL2 39
36
–
Port 1
is an 8-bit 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:
– INT3/CC0 (P1.0): interrupt 3 input /
compare 0 output /
capture 0 input
– INT4/CC1 (P1.1): interrupt 4 input /
compare 1 output /
capture 1 input
– INT5/CC2 (P1.2): interrupt 5 input /
compare 2 output /
capture 2 input
– INT6/CC3 (P1.3): interrupt 6 input /
compare 3 output /
capture 3 input
– INT2(P1.4):
interrupt 2 input
– T2EX (P1.5):
timer 2 external
reloadtrigger input
– CLKOUT (P1.6): system clock output
– T2 (P1.7):
counter 2 input
XTAL2
Input to the inverting oscillator amplifier and
input to the internal clock generator circuits.
Semiconductor Group
6-8