C511 Datasheet, PDF (8/43 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C511 / C513
Table 3
Pin Definitions and Functions
Symbol
P1.7-P1.0
Pin Number I/O*) Function
P-LCC- P-MQFP-
44
44
9-2
3-1,
I/O Port 1
44-40
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 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. Port 1 also
contains the timer 2 and SSC pins as secondary function.
In general the output latch corresponding to a secondary
function must be programmed to a one (1) for that
function to operate.
For the outputs of the SSC (SCLK, STO) special circuitry
is implemented, providing true push-pull capability. The
STO output in addition will have true tristate capability.
When used for SSC inputs, the pull-up resistors will be
switched off and the inputs will float (high ohmic inputs).
The alternate functions are assigned to port 1, as follows:
2
40
3
41
4
42
5
43
6
44
7
1
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
T2
T2EX
SCLK
SRI
STO
SLS
Input to counter 2 ¹⁾
Capture -Reload trigger of timer 2 ¹⁾
Up-Down count
SSC Master Clock Output
SSC Slave Clock Input
SSC Receive Input
SSC Transmit Output
Slave Select Input
1) _{not available in the C511/511A}
*) I = Input
O = Output
Semiconductor Group
8