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| 型号： | P89V52X2FA,512 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 17/57页 |
| 文件大小： | 0K |
| 描述： | IC 80C51 MCU FLASH 8K 44-PLCC |
| 产品培训模块： | Migrating from 8/16-Bit MCUs to 32-Bit ARMs |
| 标准包装： | 1,300 |
| 系列： | 89V |
| 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 |
| 输入/输出数： | 32 |
| 程序存储器容量： | 8KB（8K x 8） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 192 x 8 |
| RAM 容量： | 256 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 振荡器型： | 外部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 44-LCC（J 形引线） |
| 包装： | 管件 |
| 产品目录页面： | 706 (CN2011-ZH PDF) |
| 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 622-1002-ND - USB IN-CIRCUIT PROG LPC9XX |
| 其它名称： | 568-4249-5 935282528512 P89V52X2FA |
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P89V52X2_3
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 4 May 2009
24 of 57
NXP Semiconductors
P89V52X2
80C51 with 256 B RAM, 192 B data EEPROM
used as the UART transmit baud rate generator. RCLK has the same effect for the UART
receive baud rate. With these two bits, the serial port can have different receive and
transmit baud rates – Timer 1 or Timer 2.
Figure 17 shows Timer 2 in baud rate generator mode:
The baud rate generation mode is like the auto-reload mode, when a rollover in TH2
causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and
RCAP2L, which are preset by software.
The baud rates in modes 1 and 3 are determined by Timer 2’s overow rate given below:
Modes 1 and 3 Baud Rates = Timer 2 Overow Rate/16
The timer can be congured for either ‘timer’ or ‘counter’ operation. In many applications,
it is congured for ‘timer' operation (C/T2 = 0). Timer operation is different for Timer 2
when it is being used as a baud rate generator.
Usually, as a timer it would increment every machine cycle (i.e., 1
6 the oscillator
frequency). As a baud rate generator, it increments at the oscillator frequency. Thus the
baud rate formula is as follows:
Modes 1 and 3 Baud Rates =
(3)
Where: (RCAP2H, RCAP2L) = The content of RCAP2H and RCAP2L taken as a 16-bit
unsigned integer.
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 ag) is set, a 1-to-0
transition in T2EX (Timer/counter 2 trigger input) will set EXF2 (T2 external ag) 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.
Fig 17. Timer 2 in Baud Rate Generator mode
002aaa526
TX/RX baud rate
timer 2
interrupt
OSC
÷2
T2 pin
C/T2 = 0
C/T2 = 1
TL2
(8-bits)
TH2
(8-bits)
control
TR2
EXF2
RCAP2L RCAP2H
control
EXEN2
transition
detector
T2EX pin
reload
OscillatorFrequency
16
65536
RCAP2H RCAP2L
,
()
–
()
×
()
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