C501G-1E SIEMENS [Siemens Semiconductor Group], C501G-1E Datasheet - Page 12

• Manufacturer Part Number: C501G-1E
• Description: 8-Bit Single-Chip Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

1.2
This section describes all external signals of the C501 with its function.
Table 1-1
Pin Definitions and Functions
Symbol
P1.0 – P1.7 2–9
Semiconductor Group
*) I
O = Output
Pin Definitions and Functions
= Input
P-LCC-44 P-DIP-40 P-MQFP-44
2
3
Pin Number
1–8
1
2
40–44,
1–3,
40
41
1-6
I/O*) Function
I/O
Port 1
is a quasi-bidirectional I/O port with
internal pull-up resistors. Port 1 pins that
have 1s 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 (
istics) because of the internal pull-up
resistors. Port 1 also contains the timer 2
pins as secondary function. The output
latch corresponding 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 character-
Introduction
C501