参数资料
型号: P89V51RB2BBC,557
厂商: NXP Semiconductors
文件页数: 31/80页
文件大小: 0K
描述: IC 80C51 MCU 1024 RAM 44TQFP
产品培训模块: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
标准包装: 800
系列: 89V
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
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: 0°C ~ 70°C
封装/外壳: 44-TQFP
包装: 托盘
配用: 622-1017-ND - BOARD 44-ZIF PLCC SOCKET
其它名称: 935277723557
P89V51RB2BBC
P89V51RB2BBC-ND
P89V51RB2_RC2_RD2_5
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 12 November 2009
37 of 80
NXP Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
not cause a reload from (RCAP2H, RCAP2L) to (TH2,TL2). Therefore when Timer 2 is in
use as a baud rate generator, T2EX can be used as an additional external interrupt, if
needed.
When Timer 2 is in the baud rate generator mode, one should not try to read or write TH2
and TL2. Under these conditions, a read or write of TH2 or TL2 may not be accurate. The
RCAP2 registers may be read, but should not be written to, because a write might overlap
a reload and cause write and/or reload errors. The timer should be turned off (clear TR2)
before accessing the Timer 2 or RCAP2 registers. Table 24 shows commonly used baud
rates and how they can be obtained from Timer 2.
6.5.5 Summary of baud rate equations
Timer 2 is in baud rate generating mode. If Timer 2 is being clocked through pin T2 (P1.0)
the baud rate is:
Baud rate = Timer 2 overow rate / 16
If Timer 2 is being clocked internally, the baud rate is:
Baud rate = fosc / (16 × (65536 (RCAP2H, RCAP2L)))
Where fosc = oscillator frequency
To obtain the reload value for RCAP2H and RCAP2L, the above equation can be rewritten
as:
RCAP2H, RCAP2L = 65536
f
osc / (16 × baud rate)
6.6 UARTs
The UART operates in all standard modes. Enhancements over the standard 80C51
UART include Framing Error detection, and automatic address recognition.
6.6.1 Mode 0
Serial data enters and exits through RXD and TXD outputs the shift clock. Only 8 bits are
transmitted or received, LSB rst. The baud rate is xed at 1
6 of the CPU clock frequency.
UART congured to operate in this mode outputs serial clock on TXD line no matter
whether it sends or receives data on RXD line.
Table 24.
Timer 2 generated commonly used baud rates
Rate
Osc freq
Timer 2
RCAP2H
RCAP2L
750 kBd
12 MHz
FF
19.2 kBd
12 MHz
FF
D9
9.6 kBd
12 MHz
FF
B2
4.8 kBd
12 MHz
FF
64
2.4 kBd
12 MHz
FE
C8
600 Bd
12 MHz
FB
1E
220 Bd
12 MHz
F2
AF
600 Bd
6 MHz
FD
8F
220 Bd
6 MHz
F9
57
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