SAB80C517A-N18 Siemens Semiconductor Group, SAB80C517A-N18 Datasheet - Page 15

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

Pin Definitions and Functions (cont’d)
Symbol
P6.0 - P6.7 70 - 77
P8.0 - P8.3 78 - 81
*
Semiconductor Group
I = Input
O = Output
P-LCC-84
Pin Number
P-MQFP-100-2
46 - 50,
54 - 56
57 - 60
I/O
I/O
I
14
*)
Function
Port 6
is a bidirectional I/O port with internal pull-
up resistors. Port 6 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 6
pins being externally pulled low will source
current (I
because of the internal pull-up resistors.
Port 6 also contains the external A/D
converter control pin and the transmit and
receive pins for serial channel 1. The
output latch corresponding to a secondary
function must be programmed to a one (1)
for that function to operate.
The secondary functions are assigned to
the pins of port 6, as follows:
– ADST (P6.0): external A/D converter
– R D1 (P6.1): receiver data input
– T D1 (P6.2): transmitter data output
Port 8
is a 4-bit unidirectional input port. Port pins
can be used for digital input, if voltage
levels meet the specified input high/low
voltages, and for the higher 4-bit of the
multiplexed analog inputs of the A/D
converter, simultaneously
start pin
of serial interface 1
of serial interface 1
IL
SAB 80C517A/83C517A-5
, in the DC characteristics)
1994-05-01