參數(shù)資料
型號(hào)： P89V52X2FN,112
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 18/57頁(yè)
文件大?。?/td> 0K
描述： IC 80C51 MCU FLASH 8K 40-DIP
產(chǎn)品培訓(xùn)模塊： Migrating from 8/16-Bit MCUs to 32-Bit ARMs
標(biāo)準(zhǔn)包裝： 216
系列： 89V
核心處理器： 8051
芯體尺寸： 8-位
速度： 40MHz
連通性： UART/USART
外圍設(shè)備： POR
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 8KB（8K x 8）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 192 x 8
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
配用： 622-1017-ND - BOARD 44-ZIF PLCC SOCKET
622-1012-ND - BOARD FOR P89V52X2 44-TQFP
622-1008-ND - BOARD FOR LPC9103 10-HVSON
其它名稱： 568-4251-5
935282526112
P89V52X2FN
P89V52X2_3
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 4 May 2009
25 of 57
NXP Semiconductors
P89V52X2
80C51 with 256 B RAM, 192 B data EEPROM
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 20 shows commonly used baud
rates and how they can be obtained from Timer 2.
6.9.5 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)
6.10 UART
The UART operates in all standard modes. Enhancements over the standard 80C51
UART include Framing Error detection, and automatic address recognition.
6.10.1 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 20.
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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