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参数资料
| 型号： | P89V51RD2FA,512 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 20/80页 |
| 文件大小： | 0K |
| 描述： | IC 80C51 MCU FLASH 64K 44-PLCC |
| 产品培训模块： | Migrating from 8/16-Bit MCUs to 32-Bit ARMs |
| 标准包装： | 26 |
| 系列： | 89V |
| 核心处理器： | 8051 |
| 芯体尺寸： | 8-位 |
| 速度： | 40MHz |
| 连通性： | SPI，UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 32 |
| 程序存储器容量： | 64KB（64K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 1K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 44-LCC（J 形引线） |
| 包装： | 管件 |
| 产品目录页面： | 706 (CN2011-ZH PDF) |
| 配用： | 622-1017-ND - BOARD 44-ZIF PLCC SOCKET 622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP |
| 其它名称： | 568-1290-5 935276046512 P89V51RD2FA |
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P89V51RB2_RC2_RD2_5
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 12 November 2009
27 of 80
NXP Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
6.4 Timers/counters 0 and 1
The two 16-bit Timer/counter registers: Timer 0 and Timer 1 can be congured to operate
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.
Program Security Bit, Double
Clock
Input parameters:
R1 = 05H
DPL = 01H = security bit
DPL = 05H = Double Clock
Return parameter(s):
ACC = 00 = pass
ACC=!00=fail
Read Security Bit, Double Clock,
SoftICE
Input parameters:
ACC = 07H
Return parameter(s):
ACC = 00 SoftICE S/N-match 0 SB 0 DBL_CLK
Erase sector
Input parameters:
R1 = 08H
DPH = sector address high byte
DPL = sector address low byte
Return parameter(s):
ACC = 00 = pass
ACC = !00 = fail
Table 13.
IAP function calls …continued
IAP function
IAP call parameters
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| P89V51RD2FBC | 制造商:NXP Semiconductors 功能描述: |
| P89V51RD2FBC,557 | 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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| P89V51RD2FBC557 | 制造商:NXP 功能描述: |
| P89V51RD2FN | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16/32/64 kB flash microcontroller with 1 kB RAM |
| P89V51RD2FN,112 | 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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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