AT89C5132 Atmel Corporation, AT89C5132 Datasheet - Page 35

• Manufacturer Part Number: AT89C5132
• Manufacturer: Atmel Corporation

Specifications of AT89C5132

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-12C
• Max I/o Pins: 44
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Uart: 1
• Adc Channels: 2
• Adc Resolution (bits): 10
• Adc Speed (ksps): 22.7
• Sram (kbytes): 2.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 3.6
• Timers: 2
• Isp: UART/USB
• Watchdog: Yes

4173E–USB–09/07
Table 33. Priority Levels
A low-priority interrupt is always interrupted by a higher priority interrupt but not by another inter-
rupt of lower or equal priority. Higher priority interrupts are serviced before lower priority
interrupts. The response to simultaneous occurrence of equal priority interrupts is determined by
an internal hardware polling sequence detailed in Table 34. Thus within each priority level there
is a second priority structure determined by the polling sequence. The interrupt control system is
shown in Figure 10-1.
Table 34. Priority Within Same Level
Interrupt Name
INT0
Timer 0
INT1
Timer 1
Serial Port
Reserved
Audio Interface
MMC Interface
Two-wire Controller
SPI Controller
A-to-D Converter
Keyboard
Reserved
USB
Reserved
IPHxx
0
0
1
1
14 (Lowest Priority)
0 (Highest Priority)
Priority Number
10
11
12
13
IPLxx
1
2
3
4
5
6
7
8
9
0
1
0
1
Interrupt Address Vectors
Priority Level
0 Lowest
1
2
3 Highest
C:0003h
C:000Bh
C:0013h
C:001Bh
C:0023h
C:0033h
C:003Bh
C:0043h
C:004Bh
C:0053h
C:005Bh
C:0063h
C:006Bh
C:0073h
Cleared by Hardware (H)
AT89C5132
Interrupt Request Flag
or by Software (S)
H if edge, S if level
H if edge, S if level
H
H
S
S
S
S
S
S
S
S
-
-
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