SAB-C515-1R24M INFINEON [Infineon Technologies AG], SAB-C515-1R24M Datasheet - Page 8
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SAB-C515-1R24M
Manufacturer Part Number
SAB-C515-1R24M
Description
8-Bit CMOS Microcontroller
Manufacturer
INFINEON [Infineon Technologies AG]
Datasheet
1.SAB-C515-1R24M.pdf
(55 pages)
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Table 1
Pin Definitions and Functions (cont’d)
Symbol
P3.0-P3.7
Semiconductor Group
*) I = Input
O = Output
15-22
15
16
17
18
19
20
21
22
(P-MQFP-80)
Pin Number
I/O*) Function
I/O
Port 3
is an 8-bit quasi-bidirectional I/O port with internal pullup
resistors. Port 3 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 3 pins being
externally pulled low will source current ( I
characteristics) because of the internal pullup resistors.
Port 3 also contains the interrupt, timer, serial port and
external memory strobe 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. 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
P3.5 / T1
P3.6 / WR
P3.7 / RD
8
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
Timer 1 counter input
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
1997-08-01
C515
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