AT89C5131A-M(2005) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C5131A-M
(Rev.:2005)

8-bit Flash Microcontroller with Full Speed USB Device

Atmel Corporation 

Signals

4337C–USB–02/05

AT89C5130A/31A-M

All the AT89C5130A/31A-M signals are detailed by functionality on Table 1 through

Table 12.

Table 1. Keypad Interface Signal Description

Signal

Name Type Description

KIN[7:0)

Keypad Input Lines

I Holding one of these pins high or low for 24 oscillator periods triggers a

keypad interrupt if enabled. Held line is reported in the KBCON register.

Alternate

Function

P1[7:0]

Table 2. Programmable Counter Array Signal Description

Signal

Name

ECI

Type Description

I External Clock Input

CEX[4:0]

Capture External Input

I/O

Compare External Output

Alternate

Function

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

Table 3. Serial I/O Signal Description

Signal

Name Type Description

Alternate

Function

Serial Input

RxD

I The serial input is P3.0 after reset, but it can also be configured to P4.0 by

P3.0

software.

Serial Output

TxD

O The serial output is P3.1 after reset, but it can also be configured to P4.1 by

P3.1

software.

Table 4. Timer 0, Timer 1 and Timer 2 Signal Description

Signal

Name Type Description

Alternate

Function

INT0

Timer 0 Gate Input

INT0 serves as external run control for timer 0, when selected by GATE0

bit in TCON register.

I External Interrupt 0

INT0 input set IE0 in the TCON register. If bit IT0 in this register is set, bits

IE0 are set by a falling edge on INT0. If bit IT0 is cleared, bits IE0 is set by

a low level on INT0.

P3.2

INT1

Timer 1 Gate Input

INT1 serves as external run control for Timer 1, when selected by GATE1

bit in TCON register.

I External Interrupt 1

INT1 input set IE1 in the TCON register. If bit IT1 in this register is set, bits

IE1 are set by a falling edge on INT1. If bit IT1 is cleared, bits IE1 is set by

a low level on INT1.

P3.3

7

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