參數(shù)資料
型號(hào)： P89V51RB2BBC
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
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-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44
封裝： 10 X 10 MM, 1 MM HEIGHT, PLASTIC, MS-026, TQFP-44
文件頁數(shù)： 34/77頁
文件大?。?/td> 350K
代理商： P89V51RB2BBC
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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P89V51RC2 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
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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
P89V51RB2BBC,557 功能描述:8位微控制器 -MCU 16K/512 FL 12 CLK 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
P89V51RB2FA 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 16K FLASH PLCC44
P89V51RB2FA,529 功能描述:8位微控制器 -MCU 80C51 16K 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
P89V51RB2FA529 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 40MHZ LCC-44
P89V51RB2FN 制造商:NXP Semiconductors 功能描述:IC MCU 8BIT 80C51 16K FLASH DIP40 制造商:NXP Semiconductors 功能描述:IC, MCU 8BIT 80C51 16K FLASH, DIP40
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