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參數(shù)資料
| 型號： | P89LPC972FN,129 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 24/66頁 |
| 文件大小： | 0K |
| 描述： | MCU 80C51 8KB FLASH 20DIP |
| 標(biāo)準(zhǔn)包裝： | 18 |
| 系列： | LPC900 |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 18MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 18 |
| 程序存儲器容量： | 8KB（8K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 256 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.4 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 20-DIP（0.300"，7.62mm） |
| 包裝： | 管件 |
| 其它名稱： | 568-8749-5 P89LPC972FN,129-ND |
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P89LPC97X
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 3 — 8 June 2010
30 of 66
NXP Semiconductors
P89LPC970/971/972
8-bit microcontroller with accelerated two-clock 80C51 core
In the ‘Counter’ function, the register is incremented in response to a 1-to-0 transition at its
corresponding count input pin, T0 or T1. In this function, the count input is sampled once
during every machine cycle.
Timer 0 and Timer 1 have five operating modes (Modes 0, 1, 2, 3 and 6). Modes 0, 1, 2
and 6 are the same for both Timers/Counters. Mode 3 is different.
7.19.1 Mode 0
Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit
Counter with a divide-by-32 prescaler. In this mode, the Timer register is configured as a
13-bit register. Mode 0 operation is the same for Timer 0 and Timer 1.
7.19.2 Mode 1
Mode 1 is the same as Mode 0, except that all 16 bits of the timer register are used.
7.19.3 Mode 2
Mode 2 configures the Timer register as an 8-bit Counter with automatic reload. Mode 2
operation is the same for Timer 0 and Timer 1.
7.19.3.1
Mode 3
When Timer 1 is in Mode 3 it is stopped. Timer 0 in Mode 3 forms two separate 8-bit
counters and is provided for applications that require an extra 8-bit timer. When Timer 1 is
in Mode 3 it can still be used by the serial port as a baud rate generator.
7.19.3.2
Mode 6
In this mode, the corresponding timer can be changed to a PWM with a full period of
256 timer clocks.
7.19.4 Timer overflow toggle output
Timers 0 and 1 can be configured to automatically toggle a port output whenever a timer
overflow occurs. The same device pins that are used for the T0 and T1 count inputs are
also used for the timer toggle outputs. The port outputs will be a logic 1 prior to the first
timer overflow when this mode is turned on.
7.20 Timers/counters 2, 3 and 4
The P89LPC970/971/972 has three external 16-bit timer/counters. All can be configured
to operate either as timers or event counters. An option to automatically toggle pin Tx (x =
2, 3 or 4) upon timer overflow has been added.
In the ‘Timer’ function, the register is incremented every PCLK.
In the ‘Counter’ function, the register is incremented in response to a 1-to-0 transition at its
corresponding count input pin (T2/T3 /T4). In this function, the count input is sampled
once during every machine cycle.
Only external Timer 2/3/4 has the external input pin TxEX (x = 2, 3 or 4). A 1-to-0
transition on this pin can trigger a reload or capture event.
Timer 2, Timer 3 and Timer 4 have three operating modes (Modes 0, 1 and 2).
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