AT89C5132-RORUL Atmel, AT89C5132-RORUL Datasheet - Page 110

• Manufacturer Part Number: AT89C5132-RORUL
• Description: MCU 8051 FLASH USB 80TQFP
• Manufacturer: Atmel
• Series: AT89C513xr

Specifications of AT89C5132-RORUL

• Core Processor: C52X2
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IDE/ATAPI, I²C, MMC, PCM, SPI, UART/USART, USB
• Peripherals: I²S, POR, WDT
• Number Of I /o: 44
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

18.3.3
110
AT89C5132
Baud Rate Selection
(Mode 0)
Figure 18-5. Reception Waveforms (Mode 0)
In mode 0, the baud rate can be either fixed or variable.
As shown in Figure 18-6, the selection is done using M0SRC bit in BDRCON register.
Figure 18-7 gives the baud rate calculation formulas for each baud rate source.
Figure 18-6. Baud Rate Source Selection (mode 0)
Figure 18-7. Baud Rate Formulas (Mode 0)
Write to SCON
a. Fixed Formula
Baud_Rate
RXD
TXD
RI
CLOCK
CLOCK
IBRG0
PER
=
F
PER
6
Set REN, Clear RI
D0
÷ 6
D1
D2
BDRCON.0
M0SRC
D3
0
1
D4
BRL= 256
Baud_Rate=
D5
To
Serial Port
b. Variable Formula
-
D6
6
(1-SPD)
6
(1-SPD)
D7
⋅
16
⋅
F
16
PER
⋅
F
Baud_Rate
PER
⋅
4173E–USB–09/07
(256 -BRL)