AT89C51SND1C-7HTUL Atmel, AT89C51SND1C-7HTUL Datasheet - Page 155

• Manufacturer Part Number: AT89C51SND1C-7HTUL
• Description: IC MCU 64KB FLASH MEM 81-CBGA
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND1C-7HTUL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IDE/ATAPI, MMC, SPI, UART/USART, USB
• Peripherals: Audio, I²S, MP3, PCM, POR, WDT
• Number Of I /o: 44
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 81-CBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

19.3.7
4109L–8051–02/08
Slave Mode with Interrupt Policy
Figure 19-11. Slave SPI Polling Flows
Figure 19-10 shows the initialization phase and the transfer phase flows using the interrupt.
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?
AT8xC51SND1C
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