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| 型號(hào)： | P89V51RD2 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM |
| 中文描述： | 8位80C51的5 V低功耗64 kB閃存1 KB RAM內(nèi)存控制器 |
| 文件頁(yè)數(shù)： | 30/77頁(yè) |
| 文件大?。?/td> | 350K |
| 代理商： | P89V51RD2 |
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Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 03 — 02 December 2004
30 of 77
9397 750 14341
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
7.3.3
Mode 2
Mode 2 configures the Timer register as an 8-bit Counter (TLn) with automatic reload,
as shown in
Figure 10
. Overflow 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.
7.3.4
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 11
. 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 P89V51RB2/RC2/RD2 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 9.
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 10. Timer/Counter 0 or 1 in Mode 2 (8-bit auto-reload).
002aaa521
Osc/6
Tn pin
TRn
TnGate
INTn Pin
C/T = 0
C/T = 1
TLn
(8-bits)
THn
(8-bits)
TFn
control
overflow
reload
interrupt
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| P89V51RD2BN | 制造商:NXP Semiconductors 功能描述:IC MCU 8BIT 80C51 64K FLASH DIP40 制造商:NXP Semiconductors 功能描述:IC, MCU 8BIT 80C51 64K FLASH, DIP40 |
| P89V51RD2BN,112 | 功能描述:8位微控制器 -MCU 80C51 5V 16/32/64KB FLASH MCU 1 KB RAM 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 |
| P89V51RD2FA | 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 64K FLASH PLCC44 |
| P89V51RD2FA,512 | 功能描述:8位微控制器 -MCU 80C51 64K FL / 1K RM 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 |
| P89V51RD2FA512 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 40MHZ LCC-44 |
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