C517A Datasheet, PDF (7/67 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C517A
Table 2
Pin Definitions and Functions
Symbol
P1.0 - P1.7
Pin Number
P-MQFP-100
9 - 6, 1,
100 - 98
9
8
7
6
1
100
99
98
V_SS
10, 62
V_CC
11, 63
*) I = Input
O = Output
I/O*)
I/O
–
–
Function
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
Ground (0V)
during normal, idle, and power down operation.
Supply voltage
during normal, idle, and power down mode.
Semiconductor Group
7
1997-10-01