AT89C5132 Atmel Corporation, AT89C5132 Datasheet - Page 128

• 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

19.3.7
128
AT89C5132
Slave Mode with Interrupt Policy
Figure 19-11. Slave SPI Polling Policy Flows
Figure 19-10 shows the initialization phase and the transfer phase flows using the interrupt
policy.
The transfer format depends on the master controller.
Reading SPSTA at the beginning of the ISR is mandatory for clearing the SPIF flag. Clear is
effective when reading SPDAT.
Program CPOL & CPHA
write data in SPDAT
SPI Initialization
Select Slave Mode
Disable interrupt
Prepare Transfer
Polling Policy
Select Format
Enable SPI
MSTR = 0
SPEN = 1
SPIE = 0
Prepare Next Transfer
Write Data in SPDAT
Get Data Received
Polling Policy
Data Received?
SPI Transfer
Read SPDAT
SPIF = 1?
4173E–USB–09/07