AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 76

• Manufacturer Part Number: AT89C5131A-L
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-L

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

Interrupt System
Overview
Figure 39. Interrupt Control System
76
USBINT
UEPINT
AT89C5131A-L
EXF2
KBD IT
TWI IT
SPI IT
INT0
INT1
PCA IT
TF0
TF1
TF2
RI
TI
TCON.0
TCON.2
IT0
IT1
Individual Enable
1
0
0
1
The AT89C5131A-L has a total of 11 interrupt vectors: two external interrupts (INT0 and
INT1), three timer interrupts (timers 0, 1 and 2), the serial port interrupt, SPI interrupt,
Keyboard interrupt, USB interrupt and the PCA global interrupt. These interrupts are
shown in Figure 39.
IE0
IE1
IPH, IPL
3
0
Global Disable
3
0
3
0
3
0
3
0
3
0
3
0
3
0
3
0
3
0
3
0
High priority
interrupt
Interrupt
Polling
Sequence, Decreasing From
High-to-Low Priority
Low Priority
Interrupt
4338F–USB–08/07