AT89C51SND1C-ROTUL Atmel, AT89C51SND1C-ROTUL Datasheet - Page 82

• 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: -

15.1.1
15.1.2
82
AT8xC51SND1C
Clock Controller
Serial Interface Engine (SIE)
Figure 15-3 shows how to connect the AT8xC51SND1C 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 15-1. USB Device Controller Block Diagram
Figure 15-2. 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 105). Figure 15-3 shows the USB controller
clock generator and its calculation formula. The USB controller clock frequency must always be
48 MHz.
Figure 15-3. USB Clock Generator and Symbol
The SIE performs the following functions:
•
NRZI data encoding and decoding.
CLOCK
USB
D+
D-
CLOCK
PLL
48 MHz
Buffer
USB
VBUS
GND
D+
D-
USBCD1:0
USBCLK
DPLL
VSS
To Power
Supply
SIE
USBclk
VDD
12 MHz
R
=
48 MHz USB Clock
FS
------------------------------- -
USBCD
R
R
USB
USB
PLLclk
+
1
D+
D-
UFI
USB Clock Symbol
CLOCK
4109L–8051–02/08
USB
To/From
C51 Core