AT80C51SND1C-ROTIL Atmel, AT80C51SND1C-ROTIL Datasheet - Page 154

• Manufacturer Part Number: AT80C51SND1C-ROTIL
• Description: IC MCU FLASH MP3 DECODER 80-TQFP
• Manufacturer: Atmel
• Series: 80Cr

Specifications of AT80C51SND1C-ROTIL

• 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 Type: ROMless
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Other names: AT80C51SND1CROTIL

19.3.6
154
AT8xC51SND1C
Slave Mode with Polling Policy
Figure 19-10. Master SPI Interrupt Flows
Figure 19-11 shows the initialization phase and the transfer phase flows using the polling.
The transfer format depends on the master controller.
SPIF flag is cleared when reading SPDAT (SPSTA has been read before by the “end of recep-
tion” check).
This provides the fastest effective transmission and is well adapted when communicating at high
speed with other Microcontrollers. However, the process may then be interrupted at any time by
higher priority tasks.
program CPOL & CPHA
Select Master Mode
write data in SPDAT
SPI Initialization
Interrupt Policy
Enable interrupt
program SPR2:0
Select Bit Rate
Select Format
Start Transfer
Select Slave
Enable SPI
MSTR = 1
SPEN = 1
ESPI =1
Pn.x = L
write data in SPDAT
Start New Transfer
Service Routine
Get Data Received
Disable interrupt
Last Transfer?
Deselect Slave
SPI Interrupt
Read SPSTA
Read Status
read SPDAT
SPIE = 0
Pn.x = H
4109L–8051–02/08