C509-L_97 SIEMENS [Siemens Semiconductor Group], C509-L_97 Datasheet - Page 12
C509-L_97
Manufacturer Part Number
C509-L_97
Description
8-Bit CMOS Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.C509-L_97.pdf
(290 pages)
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1.2
This section describes all external signals of the C509-L with its function.
Table 1-1
Pin Definitions and Functions
Symbol
P1.0 - P1.7
Semiconductor Group
*) I = Input
O = Output
Pin Definitions and Functions
9-6, 1,
100-98
9
8
7
6
1
100
99
98
Pin Number
I/O*)
I/O
Function
Port 1
is an 8-bit bidirectional I/O port with internal pullup
resistors. Port 1 pins that have 1's written to them are
pulled high by the internal pullup resistors, and in that
state can be used as inputs. As inputs, port 1 pins being
externally pulled low will source current ( I
characteristics) because of the internal pullup resistors.
Port 1 can also be switched into a bidirectional mode, in
which CMOS levels are provided. In this bidirectional
mode, each port 1 pin can be programmed individually
as input or output.
Port 1 also contains the interrupt, timer, clock, capture
and compare pins that are used by various options. The
output latch corresponding to a secondary function must
be programmed to a one (1) for that function to operate
(except when used for the compare functions).
The secondary functions are assigned to the pins of
port 1 as follows :
P1.0 INT3 CC0 Interrupt 3 input / compare 0 output /
P1.1 INT4 CC1 Interrupt 4 input / compare 1 output /
P1.2 INT5 CC2 Interrupt 5 input / compare 2 output /
P1.3 INT6 CC3 Interrupt 6 input / compare 3 output /
P1.4 INT2 CC4 Interrupt 2 input / compare 4 output /
P1.5 T2EX
P1.6 CLKOUT
P1.7 T2
1-5
capture 0 input
capture 1 input
capture 2 input
capture 3 input
capture 4 input
Timer 2 external reload trigger input
System clock output
Counter 2 input
Introduction
IL
, in the DC
1997-10-01
C509-L
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