AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 99

• Manufacturer Part Number: AT89C51RE2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RE2

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Uart: 2
• Sram (kbytes): 8.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/OCD
• Watchdog: Yes

Baud Rate
Selection for
UART 1 for Mode 1
and 3
7663E–8051–10/08
The Baud Rate Generator for transmit and receive clocks can be selected separately via the
T2CON and BDRCON_1 registers.
Figure 41. Baud Rate Selection for UART 1
Table 67. Baud Rate Selection Table UART 1
(T2CON)
TCLK
X
X
X
0
1
0
1
0
1
TIMER1
TIMER2
TIMER1
TIMER2
INT_BRG1
INT_BRG1
(T2CON)
RCLK
X
X
X
0
0
1
1
0
1
RCLK
TCLK
0
1
0
1
(BDRCON_1)
TIMER_BRG_RX
TBCK_1
TIMER_BRG_TX
0
0
0
0
1
1
0
0
1
(BDRCON_1)
RBCK_1
0
0
0
0
0
0
1
1
1
RBCK_1
TBCK_1
0
1
0
1
Clock Source
UART Tx_1
INT_BRG_1
INT_BRG_1
INT_BRG_1
Timer 1
Timer 2
Timer 1
Timer 2
Timer 1
Timer 2
/ 16
/ 16
AT89C51RE2
Rx Clock_1
Tx Clock_1
Clock Source
UART Rx_1
INT_BRG_1
INT_BRG_1
INT_BRG_1
Timer 1
Timer 1
Timer 2
Timer 2
Timer 1
Timer 2
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