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參數(shù)資料
| 型號： | P89LV51RB2 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| 中文描述： | 8位80C51的3 V低功耗16/32/64 kB閃存1 KB RAM內(nèi)存控制器 |
| 文件頁數(shù)： | 27/77頁 |
| 文件大小： | 349K |
| 代理商： | P89LV51RB2 |
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Philips Semiconductors
P89LV51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 04 — 02 December 2004
27 of 77
9397 750 14342
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
7.3 Timers/counters 0 and 1
The two 16-bit Timer/Counter registers: Timer 0 and Timer 1 can be configured to
operate either as timers or event counters (see
Table 14
and
Table 15
).
In the ‘Timer’ function, the register is incremented every machine cycle. Thus, one
can think of it as counting machine cycles. Since a machine cycle consists of six
oscillator periods, the count rate is
1
6
of the oscillator frequency.
In the ‘Counter’ function, the register is incremented in response to a 1-to-0 transition
at its corresponding external input pin, T0 or T1. In this function, the external input is
sampled once every machine cycle.
When the samples show a high in one cycle and a low in the next cycle, the count is
incremented. The new count value appears in the register in the machine cycle
following the one in which the transition was detected. Since it takes two machine
cycles (12 oscillator periods) for 1-to-0 transition to be recognized, the maximum
count rate is
1
12
of the oscillator frequency. There are no restrictions on the duty cycle
of the external input signal, but to ensure that a given level is sampled at least once
before it changes, it should be held for at least one full machine cycle. In addition to
the ‘Timer’ or ‘Counter’ selection, Timer 0 and Timer 1 have four operating modes
from which to select.
The ‘Timer’ or ‘Counter’ function is selected by control bits C/T in the Special
Function Register TMOD. These two Timer/Counters have four operating modes,
which are selected by bit-pairs (M1, M0) in TMOD. Modes 0, 1, and 2 are the same
for both Timers/Counters. Mode 3 is different. The four operating modes are
described in the following text.
Read Security Bit, Double Clock,
SoftICE
Input parameters:
ACC = 07h
Return parameter(s):
ACC = 000 S/N-match 0 SB 0 DBL_CLK
Input parameters:
ACC = 07h
Return parameter(s):
ACC = 00 SoftICE S/N-match 0 SB 0 DBL_CLK
Input parameters:
R1 = 08h
DPH = sector address high byte
DPL = sector address low byte
Return parameter(s):
ACC = 00 = pass
ACC = !00 = fail
Read Security Bit, Double Clock,
SoftICE
Erase sector
Table 13:
IAP function
IAP function calls
…continued
IAP call parameters
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| P89LV51RB2BA | 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| P89LV51RD2BN | 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
| P89LV51RD2 | 8-bit 80C51 3 V low power 64 kB Flash microcontroller with 1 kB RAM |
| P89LV51RD2BA | 8-bit 80C51 3 V low power 64 kB Flash microcontroller with 1 kB RAM |
| P89LV51RC2 | 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| P89LV51RB2BA | 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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 |
| P89LV51RB2BA,512 | 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 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 |
| P89LV51RB2BBC | 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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 |
| P89LV51RB2BBC,557 | 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP 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 |
| P89LV51RC2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM |
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