參數(shù)資料
型號： P89V664FBC,557
廠商： NXP Semiconductors
文件頁數(shù)： 43/90頁
文件大?。?/td> 0K
描述： IC 80C51 MCU FLASH 64K 44-TQFP
產(chǎn)品培訓模塊： Migrating from 8/16-Bit MCUs to 32-Bit ARMs
標準包裝： 800
系列： 89V
核心處理器： 8051
芯體尺寸： 8-位
速度： 40MHz
連通性： I²C，SPI，UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 36
程序存儲器容量： 64KB（64K x 8）
程序存儲器類型： 閃存
RAM 容量： 2K x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-TQFP
包裝： 托盤
產(chǎn)品目錄頁面： 706 (CN2011-ZH PDF)
配用： 622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP
其它名稱： 568-2437
935280835557
P89V664FBC
P89V660_662_664
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3.1 — 17 October 2011
48 of 90
NXP Semiconductors
P89V660/662/664
80C51 with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI
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 36 shows commonly used baud
rates and how they can be obtained from Timer 2.
6.6.5 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 = 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)
6.7 UARTs
The UART operates in all standard modes. Enhancements over the standard 80C51
UART include Framing Error detection, and automatic address recognition.
Table 36.
Timer 2 generated commonly used baud rates
Rate
Oscillator frequency
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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