T89C5121-ICUIL Atmel, T89C5121-ICUIL Datasheet - Page 21

• 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

4164G–SCR–07/06
Table 6. ISEL Register
ISEL (S:BAh)
Interrupt Enable Register
Reset Value = 0X00 0000b
Number
CPLEV
Bit
7
7
6
5
4
3
2
1
0
Mnemonic
PRESEN
PRESIT
CPLEV
OELEV
OEEN
RXEN
6
RXIT
-
Bit
-
Description
Card presence detection level
This bit indicates which CPRES level will bring about an interrupt
Set this bit to indicate that Card Presence IT will appear if CPRES is at high
level.
Clear this bit to indicate that Card Presence IT will appear if CPRES is at low
level.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Card presence detection interrupt flag
Set by hardware
Must be cleared by software
Received data interrupt flag
Set by hardware
Must be cleared by software
OE/INT1 signal active level
Set this bit to indicate that high level is active.
Clear this bit to indicate that low level is active.
OE/INT1 interrupt disable bit
Clear to disable INT1 interrupt
Set to enable INT1 interrupt
Card presence detection interrupt enable bit
Clear to disable the card presence detection interrupt coming from SCIB.
Set to enable the card presence detection interrupt coming from SCIB.
Received data Interrupt enable bit
Clear to disable the RxD interrupt.
Set to enable the RxD interrupt
RXIT
5
PRESIT
4
OELEV
3
OEEN
2
A/T8xC5121
RXEN
1
PRESEN
0
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