參數(shù)資料
型號(hào)： P89V52X2FN,112
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 15/57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 大小： 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
22 of 57
NXP Semiconductors
P89V52X2
80C51 with 256 B RAM, 192 B data EEPROM
In this mode, there are two options selected by bit EXEN2 in T2CON register. If
EXEN2 = 0, then Timer 2 counts up to 0FFFFH and sets the TF2 (Overow Flag) bit upon
overow. This causes the Timer 2 registers to be reloaded with the 16-bit value in
RCAP2L and RCAP2H. The values in RCAP2L and RCAP2H are preset by software
means.
Auto reload frequency when Timer 2 is counting up can be determined from this formula:
(1)
Where SupplyFrequency is either fosc (C/T2 = 0) or frequency of signal on T2 pin
(C/T2 = 1).
If EXEN2 = 1, a 16-bit reload can be triggered either by an overow or by a 1-to-0
transition at input T2EX. This transition also sets the EXF2 bit. The Timer 2 interrupt, if
enabled, can be generated when either TF2 or EXF2 is ‘1’.
Microcontroller’s hardware will need three consecutive machine cycles in order to
recognize falling edge on T2EX and set EXF2 = 1: in the rst machine cycle pin T2EX has
to be sampled as ‘1’; in the second machine cycle it has to be sampled as ‘0’, and in the
third machine cycle EXF2 will be set to ‘1’.
In Figure 16, DCEN = 1 and Timer 2 is enabled to count up or down. This mode allows pin
T2EX to control the direction of count. When a logic ‘1’ is applied at pin T2EX Timer 2 will
count up. Timer 2 will overow at 0FFFFH and set the TF2 ag, which can then generate
an interrupt, if the interrupt is enabled. This timer overow also causes the 16-bit value in
RCAP2L and RCAP2H to be reloaded into the timer registers TL2 and TH2.
Fig 15. Timer 2 in auto-reload mode (DCEN = 0)
002aaa524
OSC
÷6
T2 pin
C/T2 = 0
C/T2 = 1
TL2
(8-bits)
TH2
(8-bits)
TF2
control
reload
TR2
timer 2
interrupt
EXF2
RCAP2L RCAP2H
control
EXEN2
transition
detector
T2EX pin
SupplyFrequency
65536
RCAP2H RCAP2L
,
()
∠
()
--------------------------------------------------------------------------------
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