AT89C51SND1C-7HTUL Atmel, AT89C51SND1C-7HTUL Datasheet - Page 153

• 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: -

19.3.5
4109L–8051–02/08
Master Mode with Interrupt
Figure 19-9. Master SPI Polling Flows
Figure 19-10 shows the initialization phase and the transfer phase flows using the interrupt.
Using this flow prevents any overrun error occurrence.
The bit rate is selected according to Table 132.
The transfer format depends on the slave peripheral.
SS may be deasserted between transfers depending also on the slave peripheral.
Reading SPSTA at the beginning of the ISR is mandatory for clearing the SPIF flag. Clear is
effective when reading SPDAT.
program CPOL & CPHA
Select Master Mode
SPI Initialization
Disable interrupt
Polling Policy
program SPR2:0
Select Bit Rate
Select Format
Enable SPI
MSTR = 1
SPEN = 1
SPIE = 0
write data in SPDAT
Get Data Received
End Of Transfer?
Polling Policy
Last Transfer?
Deselect Slave
SPI Transfer
Start Transfer
Select Slave
read SPDAT
SPIF = 1?
Pn.x = H
Pn.x = L
AT8xC51SND1C
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