SAK-C505L Infineon Technologies AG, SAK-C505L Datasheet - Page 9

• Manufacturer Part Number: SAK-C505L
• Description: 8-bit CMOS Microcontroller
• Manufacturer: Infineon Technologies AG

Table 1
Pin Definitions and Functions (cont’d)
Symbol
P3.7-P3.0
*) I = Input
Data Sheet
O = Output
Pin Number
35-42
42
41
40
39
38
37
36
35
I/O*)
I/O
Function
Port 3
is an 8-bit quasi-bidirectional port with internal pull-up
arrangement. Port 3 pins that have a 1 written to them are
pulled high by the internal pull-up transistors and in that
state can be used as inputs. As inputs, port 3 pins being
externally pulled low will source current (I
characteristics) because of the internal pullup transistors.
The output latch corresponding to a secondary function
must be programmed to a one (1) for that function to operate
(except for TxD and WR).
P3.4 and P3.5 can also be configured as LCD column
outputs C31 and C30 respectively. These pins should not be
used for input when configured as LCD output pins.
The secondary functions are assigned to the pins of port 3
as follows:
P3.0 / RxD
P3.1 / TxD
P3.2 / INT0
P3.3 / INT1
P3.4 / T0 / C31
P3.5 / T1 / C30
P3.6 / WR
P3.7 / RD
7
Receiver data input (asynch.) or data
input/output (synch.) of serial interface
Transmitter data output (asynch.) or
clock output (synch.) of serial interface
External interrupt 0 input / timer 0 gate
control input
External interrupt 1 input / timer 1 gate
control input
Timer 0 counter input / LCD column 31
output
Timer 1 counter input / LCD column 30
output
WR control output; latches the data
byte from port 0 into the external data
memory
RD control output; enables the external
data memory
IL
, in the DC
C505L
06.99