C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 11

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

1.2
This section describes all external signals of the C505 with its function.
Table 1-1
Pin Definitions and Functions
Symbol
P1.0-P1.7
*) I = Input
Semiconductor Group
O = Output
Pin Definitions and Functions
Pin Number
40-44,1-3
40
41
42
43
44
1
2
3
I/O*)
I/O
Function
Port 1
is an 8-bit quasi-bidirectional port with internal pull-up
arrangement. Port 1 pins can be used for digital input/output
or as analog inputs of the A/D converter. Port 1 pins that
have 1’s written to them are pulled high by internal pull-up
transistors and in that state can be used as inputs. As
inputs, port 1 pins being externally pulled low will source
current ( I
internal pullup transistors. Port 1 pins are assigned to be
used as analog inputs via the register P1ANA.
As secondary digital functions, port 1 contains the interrupt,
timer, clock, capture and compare pins. The output latch
c o r r e s p o n d i n g t o a s e c o n d a r y f u n c t i o n m u s t b e
programmed to a one (1) for that function to operate (except
for compare functions). The secondary functions are
assigned to the pins of port 1 as follows:
P1.0 / AN0 / INT3 / CC0 Analog input channel 0
P1.1 / AN1 / INT4 / CC1 Analog input channel 1/
P1.2 / AN2 / INT5 / CC2 Analog input channel 2 /
P1.3 / AN3 / INT6 / CC3 Analog input channel 3
P1.4 / AN4
P1.5 / AN5 / T2EX
P1.6 / AN6 / CLKOUT
P1.7 / AN7 / T2
Port 1 is used for the low-order address byte during program
verification of the C505-2R.
1-5
IL
, in the DC characteristics) because of the
Interrupt 3 input /
capture/compare channel 0 I/O
Interrupt 4 input /
capture/compare channel 1 I/O
Interrupt 5 input /
capture/compare channel 2 I/O
Interrupt 6 input /
capture/compare channel 4 I/O
Analog input channel 4
Analog input channel 5 / Timer 2
external reload / trigger input
Analog input channel 6 /
System clock output
Analog input channel 7 /
Counter 2 input
C505 / C505C
Introduction
1997-08-01