AT89C51SND1C-ROTUL Atmel, AT89C51SND1C-ROTUL Datasheet - Page 150

• Manufacturer Part Number: AT89C51SND1C-ROTUL
• Description: IC 8051 MCU FLASH 64K MP3 80TQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND1C-ROTUL

• 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: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Figure 19-5. Data Transmission Format (CPHA = 0)
Figure 19-6. Data Transmission Format (CPHA = 1)
19.1.5
150
AT8xC51SND1C
SS Management
MOSI (From Master)
MOSI (from master)
SCK Cycle Number
MISO (From Slave)
SCK cycle number
MISO (from slave)
SCK (CPOL = 0)
SCK (CPOL = 1)
SCK (CPOL = 0)
SCK (CPOL = 1)
SPEN (Internal)
SPEN (internal)
Capture point
Capture point
SS (to slave)
SS (to slave)
For simplicity, Figure 19-5 and Figure 19-6 depict the SPI waveforms in idealized form and do
not provide precise timing information. For timing parameters refer to the Section “AC
Characteristics”.
Note:
Figure 19-5 shows an SPI transmission with CPHA = 0, where the first SCK edge is the MSB
capture point. Therefore the slave starts to output its MSB as soon as it is selected: SS asserted
to low level. SS must then be deasserted between each Byte transmission (see Figure 19-7).
SPDAT must be loaded with a data before SS is asserted again.
Figure 19-6 shows an SPI transmission with CPHA = 1, where the first SCK edge is used by the
slave as a start of transmission signal. Therefore, SS may remain asserted between each Byte
transmission (see Figure 19-7).
1. When the peripheral is disabled (SPEN = 0), default SCK line is high level.
MSB
MSB
MSB
MSB
1
1
bit 6
bit 6
bit 6
bit 6
2
2
bit 5
bit 5
bit 5
bit 5
3
3
bit 4
bit 4
bit 4
bit 4
4
4
bit 3
bit 3
bit 3
bit 3
5
5
bit 2
bit 2
bit 2
bit 2
6
6
bit 1
bit 1
bit 1
bit 1
7
7
LSB
LSB
LSB
8
8
LSB
4109L–8051–02/08