參數(shù)資料
型號(hào)： P89V52X2FN,112
廠商： NXP Semiconductors
文件頁數(shù)： 10/57頁
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
18 of 57
NXP Semiconductors
P89V52X2
80C51 with 256 B RAM, 192 B data EEPROM
6.8.3 Mode 2
Mode 2 congures the Timer register as an 8-bit Counter (TLn) with automatic reload, as
shown in Figure 12. Overow from TLn not only sets TFn, but also reloads TLn with the
contents of THn, which must be preset by software. The reload leaves THn unchanged.
Mode 2 operation is the same for Timer 0 and Timer 1.
6.8.4 Mode 3
When timer 1 is in Mode 3 it is stopped (holds its count). The effect is the same as setting
TR1=0.
Timer 0 in Mode 3 establishes TL0 and TH0 as two separate 8-bit counters. The logic for
Mode 3 and Timer 0 is shown in Figure 13. TL0 uses the Timer 0 control bits: T0C/T,
T0GATE, TR0, INT0, and TF0. TH0 is locked into a timer function (counting machine
cycles) and takes over the use of TR1 and TF1 from Timer 1. Thus, TH0 now controls the
‘Timer 1’ interrupt.
Mode 3 is provided for applications that require an extra 8-bit timer. With Timer 0 in
Mode 3, the P89V52X2 can look like it has an additional Timer.
Note: When Timer 0 is in Mode 3, Timer 1 can be turned on and off by switching it into
and out of its own Mode 3. It can still be used by the serial port as a baud rate generator,
or in any application not requiring an interrupt.
Fig 11. Timer/Counter 0 or 1 in Mode 1 (16-bit counter)
002aaa520
osc/6
Tn pin
TRn
TnGate
INTn pin
C/T = 0
C/T = 1
TLn
(8-bits)
THn
(8-bits)
TFn
control
overflow
interrupt
Fig 12. Timer/Counter 0 or 1 in Mode 2 (8-bit auto-reload)
002aaa521
osc/6
Tn pin
TRn
TnGate
INTn pin
TLn
(8-bits)
THn
(8-bits)
TFn
control
overflow
reload
interrupt
C/T = 0
C/T = 1
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