參數(shù)資料
型號(hào): P89CV51RB2FBC,557
廠商: NXP Semiconductors
文件頁數(shù): 26/76頁
文件大?。?/td> 0K
描述: IC 80C51 MCU FLASH 16K 44-TQFP
產(chǎn)品培訓(xùn)模塊: Migrating from 8/16-Bit MCUs to 32-Bit ARMs
標(biāo)準(zhǔn)包裝: 800
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: EBI/EMI,SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 16KB(16K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 1K 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
其它名稱: 568-4253
935284179557
P89CV51RB2FBC
P89CV51RB2_RC2_RD2_3
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 03 — 25 August 2009
32 of 76
NXP Semiconductors
P89CV51RB2/RC2/RD2
80C51 with 1 kB RAM, SPI
There is no reload value for TL2 and TH2 in this mode. Even when a capture event occurs
from T2EX, the counter keeps on counting T2 pin transitions or fosc / 6 pulses. Since once
loaded contents of RCAP2L and RCAP2H registers are not protected, once Timer 2
interrupt is signalled it has to be serviced before a new capture event on T2EX pin occurs.
Otherwise, the next falling edge on T2EX pin will initiate reload of the current value from
TL2 and TH2 to RCAP2L and RCAP2H and consequently corrupt their content related to
the previously reported interrupt.
6.5.2 Auto-reload mode (up or down counter)
In the 16-bit auto-reload mode, Timer 2 can be congured as either a timer or counter (via
C/T2 in T2CON), then programmed to count up or down. The counting direction is
determined by bit DCEN (Down Counter Enable) which is located in the T2MOD register
(see Table 21 and Table 22). When reset is applied, DCEN = 0 and Timer 2 will default to
counting up. If the DCEN bit is set, Timer 2 can count up or down depending on the value
of the T2EX pin.
Figure 12 shows Timer 2 counting up automatically (DCEN = 0).
Fig 11. Timer 2 in Capture mode
002aaa523
OSC
÷6
T2 pin
C/T2 = 0
C/T2 = 1
TL2
(8-bits)
TH2
(8-bits)
TF2
control
capture
TR2
timer 2
interrupt
EXF2
RCAP2L RCAP2H
control
EXEN2
transition
detector
T2EX pin
Fig 12. 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
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