83C5121-IL Просмотр технического описания (PDF) - Atmel Corporation
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83C5121-IL Datasheet PDF : 115 Pages
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Table 1. Ports Description (Continued)
Port
Signal
Name
Alternate
Internal
Power
Supply
P3.0
RxD
EVCC
P3.1
TxD
EVCC
P3.2
INT0
DVCC
P3.3
INT1
OE
EVCC
P3.4
T0
EVCC
ESD
Type Description
UART function
I
Receive data input
Input/Output function
I/O
P3.0 is a bi-directional I/O port with internal pull-ups.
Reset configuration
I
Input (high level)
UART function
O Transmit data output
OE active at low or high level depending of PMSOEN bits in SIOCON Reg.
Input/Output function
I/O
P3.1 is a bi-directional I/O port with internal pull-ups.
Reset configuration
Z
High impedance due to PMOS switched OFF
External interrupt 0
I 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.
Input/Output function
I/O
P3.2 is a bi-directional I/O port with internal pull-ups.
Timer 0: Gate input
I INT0 serves as external run control for Timer 0 when
selected in TCON register.
Reset configuration
I
Input (high level)
External Interrupt 1
I 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
I
ISEL Register) on this pin disables the PMOS transistors of TxD
(P3.1) and T0 (P3.4). This function can be disabled by software
Input/Output function
I/O
P3.3 is a bi-directional I/O port with internal pull-ups.
Timer 1 function: Gate input
I INT1 serves as external run control for Timer 1 when
selected in TCON register.
Reset configuration
I
Input (high level)
UART function
O OE active at low or high level depending of PMSOEN
bits in SIOCON Reg.
6 A/T8xC5121
4164G–SCR–07/06
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