参数资料
型号: AT80C51RD2-SLSUM
厂商: Atmel
文件页数: 32/81页
文件大小: 0K
描述: IC 8051 MCU 5V SPI 20MHZ 44-PLCC
标准包装: 972
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-PLCC
包装: 管件
38
4113D–8051–01/09
AT80C51RD2
Table 11-3.
Baud Rate Selection Table UART
11.3.1
Internal Baud Rate Generator (BRG)
When the internal Baud Rate Generator is used, the Baud Rates are determined by the BRG
overflow depending on the BRL reload value, the value of SPD bit (Speed Mode) in BDRCON
register and the value of the SMOD1 bit in PCON register.
Figure 11-5. Internal Baud Rate
The baud rate for UART is token by formula:
TCLK
(T2CON)
RCLK
(T2CON)
TBCK
(BDRCON)
RBCK
(BDRCON)
Clock Source
UART Tx
Clock Source
UART Rx
0000
Timer 1
1000
Timer 2
Timer 1
0100
Timer 1
Timer 2
1100
Timer 2
X
010
INT_BRG
Timer 1
X
110
INT_BRG
Timer 2
0
X
0
1
Timer 1
INT_BRG
1
X
0
1
Timer 2
INT_BRG
X
1
INT_BRG
Peripheral clock
BRG
0
1
/6
BRL
/2
0
1
INT_BRG
BRR
auto reload counter
overflow
SPD
BaudRate
2SMOD FCLKPERIPH
×
22
6
×
1
SPD
16
×
256
BRL
()
[]
×
----------------------------------------------------------------------------------------------------------
=
BRL
()
256
2SMOD1 FCLKPERIPH
×
22
6
×
1
SPD
()
16
×
BaudRate
×
-----------------------------------------------------------------------------------------
=
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