C509-L_97 Datasheet, PDF (18/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Introduction
C509-L
Table 1-1
Pin Definitions and Functions (cont’d)
Symbol
RESET
V_AREF
V_AGND
P7.0 - P7.7
*) I = Input
O = Output
Pin Number
73
78
79
87-80
I/O*) Function
I
RESET
A low level on this pin for the duration of two machine
cycles while the oscillator is running resets the C509-L.
A small internal pullup resistor permits power-on reset
using only a capacitor connected to V_SS.
– Reference voltage for the A/D converter
– Reference ground for the A/D converter
I
Port 7
Port 7 is an 8-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 lower 8-bit
of the multiplexed analog inputs of the A/D converter
simultaneously.
P7.0 - P7.7 AIN0 - AIN7 Analog input 0 - 7
Semiconductor Group
1-11
1997-10-01