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参数资料
| 型号： | P89V664FA,512 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 39/90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： | I²C，SPI，UART/USART |
| 外围设备： | POR，PWM，WDT |
| 输入/输出数： | 36 |
| 程序存储器容量： | 64KB（64K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 2K 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： | 622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP |
| 其它名称： | 568-2436-5 935280834512 P89V664FA |
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P89V660_662_664
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3.1 — 17 October 2011
44 of 90
NXP Semiconductors
P89V660/662/664
80C51 with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI
6.6.1 Capture mode
In the Capture mode there are two options which are selected by bit EXEN2 in T2CON. If
EXEN2 = 0 Timer 2 is a 16-bit timer or counter (as selected by C/T2 in T2CON) which
upon overflowing sets bit TF2, the Timer 2 overflow bit.
The capture mode is illustrated in Figure 18.
This bit can be used to generate an interrupt (by enabling the Timer 2 interrupt bit in the
IEN0 register). If EXEN2 = 1, Timer 2 operates as described above, but with the added
feature that a 1- to -0 transition at external input T2EX causes the current value in the
Timer 2 registers, TL2 and TH2, to be captured into registers RCAP2L and RCAP2H,
respectively.
In addition, the transition at T2EX causes bit EXF2 in T2CON to be set, and EXF2 like
TF2 can generate an interrupt (which vectors to the same location as Timer 2 overflow
interrupt). The Timer 2 interrupt service routine can interrogate TF2 and EXF2 to
determine which event caused the interrupt.
There is no reload value for TL2 and TH2 in this mode. Even when a capture event occurs
from T2EX, the counter keeps on counting T2 pin transitions or fosc / 6 pulses. Since once
loaded contents of RCAP2L and RCAP2H registers are not protected, once Timer2
interrupt is signalled it has to be serviced before new capture event on T2EX pin occurs.
Otherwise, the next falling edge on T2EX pin will initiate reload of the current value from
TL2 and TH2 to RCAP2L and RCAP2H and consequently corrupt their content related to
previously reported interrupt.
Table 35.
T2MOD - Timer 2 mode control register (address C9H) bit description
Bit
Symbol
Description
7 to 2
-
Reserved for future use. Should be set to ‘0’ by user programs.
1
T2OE
Timer 2 Output Enable bit. Used in programmable clock-out mode
only.
0
DCEN
Down Count Enable bit. When set, this allows Timer 2 to be configured
as an up/down-counter.
Fig 18. Timer 2 in Capture mode
002aaa523
OSC
÷6
T2 pin
C/T2 = 0
C/T2 = 1
TL2
(8-bits)
TH2
(8-bits)
TF2
control
capture
TR2
timer 2
interrupt
EXF2
RCAP2L RCAP2H
control
EXEN2
transition
detector
T2EX pin
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相关代理商/技术参数 |
参数描述 |
|---|---|
| P89V664FBC | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:8-bit 80C51 5 V low power 16 kB/32 kB/64 kB flash microcontroller with 512 B/1 kB/2 kB RAM, dual I2C-bus, SPI |
| P89V664FBC,557 | 功能描述:8位微控制器 -MCU 80C51 64K FL / 2K 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 |
| P89V664FBC557 | 制造商:NXP Semiconductors 功能描述:IC 8BIT MCU 80C51 40MHZ TQFP-44 |
| P8-A000001 | 制造商:OTTO Engineering Inc 功能描述:P8-A141313 EXCEPT |
| P8-A000003 | 制造商:OTTO Engineering Inc 功能描述:P8-A121213 WITH |
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