AT89C5131A-M Atmel Corporation, AT89C5131A-M Datasheet - Page 120

no-image

AT89C5131A-M

Manufacturer Part Number
AT89C5131A-M
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of AT89C5131A-M

Flash (kbytes)
32 Kbytes
Max. Operating Frequency
48 MHz
Cpu
8051-12C
Max I/o Pins
34
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
1
Uart
1
Sram (kbytes)
1.25
Eeprom (bytes)
1024
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 5.5
Timers
4
Isp
UART/USB
Watchdog
Yes
21. USB Controller
21.1
Figure 21-1. USB Device Controller Block Diagram
21.1.1
120
Description
AT89C5130A/31A-M
Serial Interface Engine (SIE)
D+
D-
.
The USB device controller provides the hardware that the AT89C5131 needs to interface a USB
link to a data flow stored in a double port memory (DPRAM).
The USB controller requires a 48 MHz ±0.25% reference clock, which is the output of the
AT89C5131 PLL (see Section “PLL”, page 15) divided by a clock prescaler. This clock is used to
generate a 12 MHz Full-speed bit clock from the received USB differential data and to transmit
data according to full speed USB device tolerance. Clock recovery is done by a Digital Phase
Locked Loop (DPLL) block, which is compliant with the jitter specification of the USB bus.
The Serial Interface Engine (SIE) block performs NRZI encoding and decoding, bit stuffing, CRC
generation and checking, and the serial-parallel data conversion.
The Universal Function Interface (UFI) realizes the interface between the data flow and the Dual
Port RAM.
The SIE performs the following functions:
USB
D+/D-
Buffer
• NRZI data encoding and decoding.
• Bit stuffing and un-stuffing.
• CRC generation and checking.
• Handshakes.
• TOKEN type identifying.
DPLL
SIE
48 MHz
12 MHz
+/- 0.25%
UFI
C51
Microcontroller
Interface
Up to 48 MHz
UC_sysclk
4337K–USB–04/08

Related parts for AT89C5131A-M