AT89C5131A-M(2005) View Datasheet(PDF) - Atmel Corporation
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AT89C5131A-M Datasheet PDF : 184 Pages
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Table 4. Timer 0, Timer 1 and Timer 2 Signal Description (Continued)
Signal
Name Type Description
Timer Counter 0 External Clock Input
T0
I When Timer 0 operates as a counter, a falling edge on the T0 pin
increments the count.
Timer/Counter 1 External Clock Input
T1
I When Timer 1 operates as a counter, a falling edge on the T1 pin
increments the count.
I Timer/Counter 2 External Clock Input
T2
O Timer/Counter 2 Clock Output
T2EX
I Timer/Counter 2 Reload/Capture/Direction Control Input
Alternate
Function
P3.4
P3.5
P1.0
P1.1
Table 5. LED Signal Description
Signal
Name Type Description
Alternate
Function
LED[3:0]
Direct Drive LED Output
These pins can be directly connected to the Cathode of standard LEDs
O without external current limiting resistors. The typical current of each
output can be programmed by software to 2, 6 or 10 mA. Several outputs
can be connected together to get higher drive capabilities.
P3.3
P3.5
P3.6
P3.7
Table 6. TWI Signal Description
Signal
Name
SCL
SDA
Type Description
SCL: TWI Serial Clock
I/O SCL output the serial clock to slave peripherals.
SCL input the serial clock from master.
I/O
SDA: TWI Serial Data
SCL is the bidirectional TWI data line.
Alternate
Function
P4.0
P4.1
Table 7. SPI Signal Description
Signal
Name
SS
Type Description
I/O SS: SPI Slave Select
Alternate
Function
P1.1
MISO
MISO: SPI Master Input Slave Output line
I/O When SPI is in master mode, MISO receives data from the slave
peripheral. When SPI is in slave mode, MISO outputs data to the master
controller.
P1.5
SCK
SCK: SPI Serial Clock
I/O
SCK outputs clock to the slave peripheral or receive clock from the master
P1.6
MOSI
I/O MOSI: SPI Master Output Slave Input line
When SPI is in master mode, MOSI outputs data to the slave peripheral.
When SPI is in slave mode, MOSI receives data from the master controller
P1.7
8 AT89C5130A/31A-M
4337C–USB–02/05
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