C515C Datasheet, PDF (9/69 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C515C
Table 1
Pin Definitions and Functions (cont’d)
Symbol
P7.0 / INT7
P1.0 - P1.7
*) I = Input
O = Output
Pin Number
P-MQFP-80
23
31-24
31
30
29
28
27
26
25
24
I/O*) Function
I/O Port 7
is an 1-bit quasi-bidirectional I/O port with internal pull-up
resistor. When a 1 is written to P7.0 it is pulled high by an
internal pull-up resistor, and in that state can be used as
input. As input, P7.0 being externally pulled low will
source current (I _IL, in the DC characteristics) because of
the internal pull-up resistor. If P7.0 is used as interrupt
input, its output latch must be programmed to a one (1).
The secondary function is assigned to the port 7 pin as
follows:
P7.0 INT7 Interrupt 7 input
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
Interrupt 2 input
P1.5 T2EX
Timer 2 external reload / trigger
input
P1.6 CLKOUT System clock output
P1.7 T2
Counter 2 input
Semiconductor Group
9
1997-07-01