AT89C51SND2C-7FTUL Atmel, AT89C51SND2C-7FTUL Datasheet - Page 104

• Manufacturer Part Number: AT89C51SND2C-7FTUL
• Description: IC 8051 MCU FLASH 64K MP3 100BGA
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51SND2C-7FTUL

• 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: 32
• 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; D/A 2x20b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFBGA
• Data Bus Width: 8 bit
• Data Ram Size: 2.25 KB
• Interface Type: ATAPI, I2S, IDE, SPI, UART, USB
• Maximum Clock Frequency: 40 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: AT89C51SND2C7FTUL

16.3.1
104
AT8xC51SND2C/MP3B
Clock Controller
Figure 16-3 shows how to connect the AT8xC51SND2C to the USB connector. D+ and D- pins
are connected through 2 termination resistors. A pull-up resistor is implemented on D+ to inform
the host of a full speed device connection. Value of these resistors is detailed in the section “DC
Characteristics”.
Figure 16-1. USB Device Controller Block Diagram
Figure 16-2. USB Connection
The USB controller clock is generated by division of the PLL clock. The division factor is given by
USBCD1:0 bits in USBCLK register (see Table 16-16). Figure 16-3 shows the USB controller
clock generator and its calculation formula. The USB controller clock frequency must always be
48 MHz.
Figure 16-3. USB Clock Generator and Symbol
CLOCK
USB
D+
CLOCK
D-
PLL
48 MHz
Buffer
USB
USBCD1:0
VBUS
USBCLK
GND
D+
D-
DPLL
VSS
SIE
To Power
Supply
USBclk
=
48 MHz USB Clock
VDD
12 MHz
------------------------------- -
USBCD
R
PLLclk
FS
R
R
USB
USB
+
1
UFI
D+
D-
USB Clock Symbol
CLOCK
USB
4341H–MP3–10/07
To/From
C51 Core