SAB80C517 Datasheet, PDF (7/61 Pages) Siemens Semiconductor Group – 8-Bit CMOS Single-Chip Microcontroller

SAB 80C517/80C537
Pin Definitions and Functions
Symbol
Pin Number
I/O ^*) _Function
P-LCC-84 P-MQFP-100-2
P4.0 – P4.7 1– 3, 5 – 9 64 - 66,
68 - 72
PE/SWD 4
67
* _{I = Input}
O = Output
I/O Port 4
is a bidirectional I/O port with internal
pull-up resistors. Port 4 pins that have
1 s written to them are pulled high by
the internal pull-up resistors, and in that
state can be used as inputs. As inputs,
port 4 pins being externally pulled low
will source current (I_IL, in the DC
characteristics) because of the internal
pull-up resistors.
This port also serves alternate compare
functions. The secondary functions are
assigned to the pins of port 4 as
follows:
– CM0 (P4.0): Compare Channel 0
– CM1 (P4.1): Compare Channel 1
– CM2 (P4.2): Compare Channel 2
– CM3 (P4.3): Compare Channel 3
– CM4 (P4.4): Compare Channel 4
– CM5 (P4.5): Compare Channel 5
– CM6 (P4.6): Compare Channel 6
– CM7 (P4.7): Compare Channel 7
I
Power saving modes enable/
Start Watchdog Timer
A low level on this pin allows the
software to enter the power down, idle
and slow down mode. In case the low
level is also seen during reset, the
watchdog timer function is off on
default.
Use of the software controlled power
saving modes is blocked, when this pin
is held on high level. A high level during
reset performs an automatic start of the
watchdog timer immediately after reset.
When left unconnected this pin is pulled
high by a weak internal pull-up resistor.
Semiconductor Group
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