T83C5121 datasheet(5/110 Pages) ATMEL

5 / 110 page

T8xC5121

4164E–SCR–02/04

P3.0

RxD

EVCC

UART function

Receive data input

I/O

Input/Output function

P3.0 is a bi-directional I/O port with internal pull-ups.

Reset configuration

Input (high level)

P3.1

TxD

EVCC

UART function

Transmit data output

OE active at low or high level depending of PMSOEN bits in SIOCON Reg.

I/O

Input/Output function

P3.1 is a bi-directional I/O port with internal pull-ups.

Reset configuration

High impedance due to PMOS switched OFF

P3.2

INT0

DVCC

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.

I/O

Input/Output function

P3.2 is a bi-directional I/O port with internal pull-ups.

Timer 0: Gate input

INT0 serves as external run control for Timer 0 when

selected in TCON register.

Reset configuration

Input (high level)

P3.3

INT1

EVCC

External Interrupt 1

INT1 input set OEIT in ISEL Register, IE1 in the TCON register.

If bit IT1 in this register is set, bits OEIT and IE1 are set by a falling edge on

INT1. If bit IT1 is cleared, bits OEIT and IE1 is set by a low level on INT1

UART function

Output enable. A low or high level (depending OELEV bit in

ISEL Register) on this pin disables the PMOS transistors of TxD

(P3.1) and T0 (P3.4). This function can be disabled by software

I/O

Input/Output function

P3.3 is a bi-directional I/O port with internal pull-ups.

Timer 1 function: Gate input

INT1 serves as external run control for Timer 1 when

selected in TCON register.

Reset configuration

Input (high level)

P3.4

EVCC

UART function

OE active at low or high level depending of PMSOEN

bits in SIOCON Reg.

Table 1. Ports Description (Continued)

Port

Signal

Name

Alternate

Internal

Power

Supply

ESD

Type

Description

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