C517A_99 Datasheet, PDF (17/218 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Introduction
C517A
Table 1-1
Pin Definitions and Functions (cont’d)
6\PERO
P6.0 - P6.7
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46 - 50,
54 - 56
70 - 77
46
47
48
P8.0 - P8.3 57 - 60
70
71
72
78 - 81
RO
61
82
*) I = Input
O = Output
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I/O Port 6
is a quasi-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 _IL, in the DC characteristics)
because of the internal pull-up resistors.
Port 6 also contains the external A/D
converter start control pin and the transmit
and receive pins for the serial interface 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 :
P6.0 ADST external A/D converter
start pin
P6.1 RxD1 receiver data input of serial
interface 1
P6.2 TxD1 transmitter data input of
serial interface 1
I
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.
P8.0 - P8.3 AIN8 - AIN11 analog
input 8 - 11
O Reset Output
This pin outputs the internally synchronized
reset request signal. This signal may be
generated by an external hardware reset, a
watchdog timer reset or an oscillator
watchdog reset. The RO output signal is
active low.
Semiconductor Group
1-11