SAF-C502-2R20N Siemens Semiconductor Group, SAF-C502-2R20N Datasheet - Page 8

• Manufacturer Part Number: SAF-C502-2R20N
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: Siemens Semiconductor Group

Pin Definitions and Functions
Symbol
P1.7 – P1.0
*) I = Input
Semiconductor Group
O = Output
P-LCC-44
9–2
2
3
Pin Number
P-DIP-40
8–1
1
2
I/O*)
I
7
Function
Port 1
is a bidirectional I/O port with internal pull-up
resistors. Port 1 pins that have 1s 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 (
characteristics) because of the internal pull-up
resistors. Port 1 also contains the timer 2 pins
as secondary function. The output latch corre-
sponding to a secondary function must be pro-
grammed to a one (1) for that function to
operate.
The secondary functions are assigned to the
pins of port 1, as follows:
P1.0 T2
P1.1 T2EX Capture - Reload trigger of
Input to counter 2
timer 2 / Up-Down count
I
IL
, in the DC
C502