SAB80C517A-N18 Siemens Semiconductor Group, SAB80C517A-N18 Datasheet - Page 8

• Manufacturer Part Number: SAB80C517A-N18
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: Siemens Semiconductor Group

Pin Definitions and Functions
Symbol
P4.0 – P4.7 1– 3, 5 – 9
PE/SWD
*
Semiconductor Group
I = Input
O = Output
P-LCC-84
4
Pin Number
P-MQFP-100-2
64 - 66,
68 - 72
67
7
I/O
I/O
I
*)
Function
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
acteristics) 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
Power saving modes enable Start
Watchdog Timer
A low level on this pin allows the soft-
ware 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.
SAB 80C517A/83C517A-5
IL,
in the DC char-
1994-05-01