AT89C5132 Atmel Corporation, AT89C5132 Datasheet - Page 88

• Manufacturer Part Number: AT89C5132
• Manufacturer: Atmel Corporation

Specifications of AT89C5132

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-12C
• Max I/o Pins: 44
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Uart: 1
• Adc Channels: 2
• Adc Resolution (bits): 10
• Adc Speed (ksps): 22.7
• Sram (kbytes): 2.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 3.6
• Timers: 2
• Isp: UART/USB
• Watchdog: Yes

Figure 16-9. MMC Controller Block Diagram
16.4
Figure 16-10. MMC Clock Generator and Symbol
Figure 16-11. Configuration Flow
16.5
88
Clock Generator
Command Line Controller
AT89C5132
CLOCK
Internal
OSC
Bus
CLOCK
OSC
MMCON2.7
MMCEN
The MMC clock is generated by division of the oscillator clock (F
troller block as detailed in Section "Oscillator", page 12. The division factor is given by MMCD7:0
Bits in MMCLK register. Figure 16-10 shows the MMC clock generator and its output clock cal-
culation 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 16-11 shows the MMC controller configuration flow.
As exposed in Section “Clock Control”, MMCD7:0 Bits can be used to dynamically increase or
reduce the MMC clock.
As shown in Figure 16-12, the command line controller is divided in two channels: the command
transmitter channel that handles the command transmission to the card through the MCMD line
and the command receiver channel that handles the response reception from the card through
the MCMD line. These channels are detailed in the following sections.
Generator
Clock
8
MMCD7:0
MMCLK
Configure MMC Clock
MMC Controller
Configuration
MMCLK = XXh
MMCEN = 1
FLOWC = 0
Command Line
Controller
Controller
Data Line
Controller Clock
MMC Clock
Controller
Interrupt
MMCclk
OSC
MMC Clock Symbol
) issued from the Clock Con-
CLOCK
MMC
=
---------------------------- -
MMCD
MMC
Interrupt
Request
OSCclk
MCLK
MCMD
MDAT
4173E–USB–09/07
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