89C5121-SK1 Atmel, 89C5121-SK1 Datasheet - Page 6

• Manufacturer Part Number: 89C5121-SK1
• Description: KIT SMART CARD FOR AT89C5121
• Manufacturer: Atmel
• Type: Smart Cardr

Specifications of 89C5121-SK1

• Contents: Board
• For Use With/related Products: AT89C5121
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: T89C5121-SK1; T89C5121-SK1

Table 1. Ports Description (Continued)
6
Port
P3.0
P3.1
P3.2
P3.3
P3.4
A/T8xC5121
Signal
Name
INT0
INT1
RxD
TxD
Alternate
OE
T0
Internal
Supply
Power
DV
EV
EV
EV
EV
CC
CC
CC
CC
CC
ESD
Type
I/O
I/O
I/O
I/O
O
O
Z
I
I
I
I
I
I
I
I
I
Description
UART function
Receive data input
Input/Output function
P3.0 is a bi-directional I/O port with internal pull-ups.
Reset configuration
Input (high level)
UART function
Transmit data output
OE active at low or high level depending of PMSOEN bits in SIOCON Reg.
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
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.
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)
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
(P3.1) and T0 (P3.4). This function can be disabled by software
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)
UART function
OE active at low or high level depending of PMSOEN
bits in SIOCON Reg.
ISEL Register) on this pin disables the PMOS transistors of TxD
4164G–SCR–07/06