參數(shù)資料
型號： P89V51RC2
廠商： NXP Semiconductors N.V.
英文描述： 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
中文描述： 8位80C51的5 V低功耗16/32/64 kB閃存1 KB RAM內(nèi)存控制器
文件頁數(shù)： 34/77頁
文件大?。?/td> 350K
代理商： P89V51RC2
Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
34 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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 (Overflow Flag) bit
upon overflow. 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 f
osc
(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 overflow 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 first 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 14
, 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 overflow at 0FFFFH and set the TF2 flag,
which can then generate an interrupt, if the interrupt is enabled. This timer overflow
also causes the 16-bit value in RCAP2L and RCAP2H to be reloaded into the timer
registers TL2 and TH2.
Fig 13. 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
65536
RCAP2H RCAP2L
)
--------------------------------------------------------------------------------
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PDF描述
P89V51RC2BN 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RD2 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
P89V51RC2BN 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RC2FA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RC2FA,512 功能描述:8位微控制器 -MCU 80C51 32K FL / 512 R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
P89V51RC2FBC 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16/32/64 kB flash microcontroller with 1 kB RAM
P89V51RC2FBC,557 功能描述:8位微控制器 -MCU 80C51 32K FL / 512 R RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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