AT89C51SND1C-7HTUL Atmel, AT89C51SND1C-7HTUL Datasheet - Page 156

• 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: -

19.4
156
Registers
AT8xC51SND1C
Figure 19-12. Slave SPI Interrupt Policy Flows
Table 133. SPCON Register
SPCON (S:C3h) – SPI Control Register
Number
SPR2
Bit
7
7
6
5
4
3
2
program CPOL & CPHA
Mnemonic Description
write data in SPDAT
SPI Initialization
Select Slave Mode
Interrupt Policy
Prepare Transfer
Enable interrupt
SSDIS
SPEN
SPEN
MSTR
CPOL
CPHA
SPR2
Select Format
Bit
Enable SPI
6
MSTR = 0
SPEN = 1
ESPI =1
SPI Rate Bit 2
Refer to Table 132 for bit rate description.
SPI Enable Bit
Set to enable the SPI interface.
Clear to disable the SPI interface.
Slave Select Input Disable Bit
Set to disable SS in both master and slave modes. In slave mode this bit has no
effect if CPHA = 0.
Clear to enable SS in both master and slave modes.
Master Mode Select
Set to select the master mode.
Clear to select the slave mode.
SPI Clock Polarity Bit
Set to have the clock output set to high level in idle state.
Clear to have the clock output set to low level in idle state.
SPI Clock Phase Bit
Set to have the data sampled when the clock returns to idle state (see CPOL).
Clear to have the data sampled when the clock leaves the idle state (see CPOL).
SSDIS
5
MSTR
4
(1)
CPOL
3
Prepare New Transfer
write data in SPDAT
Service Routine
Get Data Received
SPI Interrupt
Read SPSTA
read SPDAT
Get Status
CPHA
2
SPR1
1
4109L–8051–02/08
SPR0
0