AT83C5136-RDTUL datasheet(8/171 Pages) ATMEL

8 / 171 page

AT83C5134/35/36

7683B–USB–03/07

Table 5. LED Signal Description

Table 6. TWI Signal Description

Table 7. SPI Signal Description

Timer Counter 0 External Clock Input

When Timer 0 operates as a counter, a falling edge on the T0 pin

increments the count.

P3.4

Timer/Counter 1 External Clock Input

When Timer 1 operates as a counter, a falling edge on the T1 pin

increments the count.

P3.5

Timer/Counter 2 External Clock Input

Timer/Counter 2 Clock Output

P1.0

T2EX

Timer/Counter 2 Reload/Capture/Direction Control Input

P1.1

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

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

Signal

Name

Type

Description

Alternate

Function

SCL

I/O

SCL: TWI Serial Clock

SCL output the serial clock to slave peripherals.

SCL input the serial clock from master.

P4.0

SDA

I/O

SDA: TWI Serial Data

SCL is the bidirectional TWI data line.

P4.1

Signal

Name

Type

Description

Alternate

Function

I/O

SS: SPI Slave Select . This I/O is 5 Volt tolerant

P1.1

MISO

I/O

MISO: SPI Master Input Slave Output line

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. This I/O is 5 Volt tolerant

P1.5

SCK

I/O

SCK: SPI Serial Clock

SCK outputs clock to the slave peripheral or receive clock from the master.

This I/O is 5 Volt tolerant.

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.

This I/O is 5 Volt tolerant.

P1.7

Table 4. Timer 0, Timer 1 and Timer 2 Signal Description (Continued)

Signal

Name

Type

Description

Alternate

Function

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