AT89C51SND1C-ROTUL Atmel, AT89C51SND1C-ROTUL Datasheet - Page 115

• 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 16-9. MMC Controller Block Diagram
Figure 16-10. MMC Connection
16.4
Figure 16-11. MMC Clock Generator and Symbol
4109L–8051–02/08
Clock Generator
CLOCK
Internal
OSC
Bus
CLOCK
OSC
MMCON2.7
MMCEN
Figure 16-10 shows the external components to add for connecting a MMC or a SD card to the
AT8xC51SND1C. MDAT and MCMD signals are connected to pull-up resistors. Value of these
resistors is detailed in the Section “DC Characteristics”, page 181.
The MMC clock is generated by division of the oscillator clock (F
troller block as detailed in Section "Oscillator", page 13. The division factor is given by MMCD7:0
bits in MMCLK register, a value of 0x00 stops the MMC clock. Figure 16-11 shows the MMC
clock generator and its output clock calculation formula.
As soon as MMCEN bit in MMCON2 is set, the MMC controller receives its system clock. The
MMC command and data clock is generated on MCLK output and sent to the command line and
data line controllers. Figure 16-12 shows the MMC controller configuration flow.
As exposed in Section “Clock Control”, page 114, MMCD7:0 bits can be used to dynamically
increase or reduce the MMC clock.
Generator
Clock
8
MMCD7:0
VDD
MMCLK
R
R
CMD
DAT
Command Line
Controller
Controller
Data Line
MDAT
MCMD
Controller Clock
MMC Clock
Controller
Interrupt
MMCclk
OSC
MMC Clock Symbol
AT8xC51SND1C
) issued from the Clock Con-
CLOCK
MMC
=
---------------------------- -
MMCD
MMC
Interrupt
Request
OSCclk
MCLK
MCMD
MDAT
+
1
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