AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 70

• Manufacturer Part Number: AT89C5131A-L
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-L

• 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): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

Figure 38. Internal Baud Rate
70
AT89C5131A-L
Peripheral Clock
BRR
•
The baud rate for UART is token by formula:
/6
(BRL) = 256
Baud_Rate =
SPD
0
1
auto reload counter
-
2 x 6
2 x 6
BRG
BRL
(1-SPD)
(1-SPD)
2
2
SMOD1
overflow
SMOD1
x 16 x Baud_Rate
x 16 x [256 - (BRL)]
x F
x
F
CLK PERIPH
CLK PERIPH
/2
SMOD1
0
1
INT_BRG
4338F–USB–08/07