T89C5121-ICUIL Atmel, T89C5121-ICUIL Datasheet - Page 20

• Manufacturer Part Number: T89C5121-ICUIL
• Description: IC 8051 MCU W/SMART CARD 24SSOP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of T89C5121-ICUIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SmartCard, UART/USART
• Peripherals: LED, POR, WDT
• Number Of I /o: 14
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: Flash RAM
• Eeprom Size: 16K x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 5.4 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: Q1468934; T89C5121-ICSIL; T89C5121-ICSIL

20
A/T8xC5121
Table 5. IE0 Register
IE0
Interrupt Enable Register (A8h)
Reset Value = 0XX0 0000b
Number
EA
Bit
7
7
6
5
4
3
2
1
0
Mnemonic
6
-
ET1
EX1
ET0
EX0
Bit
EA
ES
-
-
Description
Enable All interrupt bit
Clear to disable all interrupts.
Set to enable all interrupts.
If EA = 1, each interrupt source is individually enabled or disabled by setting or
clearing its interrupt enable bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Serial port Enable bit
Clear to disable serial port interrupt.
Set to enable serial port interrupt.
Timer 1 overflow interrupt Enable bit
Clear to disable Timer 1 overflow interrupt.
Set to enable Timer 1 overflow interrupt.
External interrupt 1 Enable bit
Clear to disable external interrupt 1.
Set to enable external interrupt 1.
Timer 0 overflow interrupt Enable bit
Clear to disable Timer 0 overflow interrupt.
Set to enable Timer 0 overflow interrupt.
External interrupt 0 Enable bit
Clear to disable external interrupt 0.
Set to enable external interrupt 0.
5
-
ES
4
ET1
3
EX1
2
ET0
1
4164G–SCR–07/06
EX0
0