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參數(shù)資料
| 型號： | P89V51RB2BBC |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | 10 X 10 MM, 1 MM HEIGHT, PLASTIC, MS-026, TQFP-44 |
| 文件頁數(shù)： | 37/77頁 |
| 文件大?。?/td> | 350K |
| 代理商： | P89V51RB2BBC |
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Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
37 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
The Timer 2 as a baud rate generator mode is valid only if RCLK and/or TCLK =
1
in
T2CON register. Note that a rollover in TH2 does not set TF2, and will not generate
an interrupt. Thus, the Timer 2 interrupt does not have to be disabled when Timer 2 is
in the baud rate generator mode. Also if the EXEN2 (T2 external enable flag) is set, a
1-to-0 transition in T2EX (Timer/counter 2 trigger input) will set EXF2 (T2 external
flag) but will 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.
7.4.5
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 overflow rate / 16
If Timer 2 is being clocked internally, the baud rate is:
Baud rate = f
osc
/ (16
×
(65536
(RCAP2H, RCAP2L)))
Where f
osc
= 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)
7.5 UARTs
The UART operates in all standard modes. Enhancements over the standard 80C51
UART include Framing Error detection, and automatic address recognition.
Table 24:
Baud rate
Timer 2 generated commonly used baud rates
Osc freq
Timer 2
RCAP2H
FF
FF
FF
FF
FE
FB
F2
FD
F9
RCAP2L
FF
D9
B2
64
C8
1E
AF
8F
57
750K
19.2K
9.6K
4.8K
2.4K
600
220
600
220
12 MHz
12 MHz
12 MHz
12 MHz
12 MHz
12 MHz
12 MHz
6 MHz
6 MHz
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P89V51RB2BBC,557 | 功能描述:8位微控制器 -MCU 16K/512 FL 12 CLK RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| P89V51RB2FA | 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 16K FLASH PLCC44 |
| P89V51RB2FA,529 | 功能描述:8位微控制器 -MCU 80C51 16K FL / 512 R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| P89V51RB2FA529 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 40MHZ LCC-44 |
| P89V51RB2FN | 制造商:NXP Semiconductors 功能描述:IC MCU 8BIT 80C51 16K FLASH DIP40 制造商:NXP Semiconductors 功能描述:IC, MCU 8BIT 80C51 16K FLASH, DIP40 |
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