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參數(shù)資料
| 型號(hào)： | P89LPC935FDH,529 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 43/77頁 |
| 文件大小： | 0K |
| 描述： | IC 80C51 MCU FLASH 8K 28-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Migrating from 8/16-Bit MCUs to 32-Bit ARMs |
| 標(biāo)準(zhǔn)包裝： | 51 |
| 系列： | LPC900 |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 12MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，LED，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 26 |
| 程序存儲(chǔ)器容量： | 8KB（8K x 8） |
| 程序存儲(chǔ)器類型： | 閃存 |
| EEPROM 大?。?/td> | 512 x 8 |
| RAM 容量： | 768 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.4 V ~ 3.6 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x8b; D/A 2x8b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 28-TSSOP（0.173"，4.40mm 寬） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 706 (CN2011-ZH PDF) |
| 配用： | 622-1014-ND - BOARD FOR LPC9XX TSSOP 622-1008-ND - BOARD FOR LPC9103 10-HVSON 622-1006-ND - SOCKET ADAPTER BOARD 568-4000-ND - DEMO BOARD SPI/I2C TO DUAL UART 568-3510-ND - DEMO BOARD SPI/I2C TO UART 622-1002-ND - USB IN-CIRCUIT PROG LPC9XX 568-1759-ND - EMULATOR DEBUGGER/PROGRMMR LPC9X 568-1758-ND - BOARD EVAL FOR LPC93X MCU FAMILY |
| 其它名稱： | 568-1288-5 935274646529 P89LPC935FDH-S |
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P89LPC933_934_935_936
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 8 — 12 January 2011
48 of 77
NXP Semiconductors
P89LPC933/934/935/936
8-bit microcontroller with accelerated two-clock 80C51 core
8.25 Watchdog timer
The watchdog timer causes a system reset when it underflows as a result of a failure to
feed the timer prior to the timer reaching its terminal count. It consists of a programmable
12-bit prescaler, and an 8-bit down counter. The down counter is decremented by a tap
taken from the prescaler. The clock source for the prescaler is either the PCLK or the
nominal 400 kHz watchdog oscillator. The watchdog timer can only be reset by a
power-on reset. When the watchdog feature is disabled, it can be used as an interval
timer and may generate an interrupt. Figure 22 shows the watchdog timer in Watchdog
mode. Feeding the watchdog requires a two-byte sequence. If PCLK is selected as the
watchdog clock and the CPU is powered-down, the watchdog is disabled. The watchdog
timer has a time-out period that ranges from a few
μs to a few seconds. Please refer to the
P89LPC933/934/935/936 User manual for more details.
8.26 Additional features
8.26.1 Software reset
The SRST bit in AUXR1 gives software the opportunity to reset the processor completely,
as if an external reset or watchdog reset had occurred. Care should be taken when writing
to AUXR1 to avoid accidental software resets.
8.26.2 Dual data pointers
The dual Data Pointers (DPTR) provides two different Data Pointers to specify the
address used with certain instructions. The DPS bit in the AUXR1 register selects one of
the two Data Pointers. Bit 2 of AUXR1 is permanently wired as a logic 0 so that the DPS
bit may be toggled (thereby switching Data Pointers) simply by incrementing the AUXR1
register, without the possibility of inadvertently altering other bits in the register.
(1) Watchdog reset can also be caused by an invalid feed sequence, or by writing to WDCON not immediately followed by a feed
sequence.
Fig 22. Watchdog timer in Watchdog mode (WDTE = 1)
PRE2
PRE1
PRE0
-
WDRUN
WDTOF
WDCLK
WDCON (A7H)
SHADOW REGISTER
PRESCALER
002aaa905
8-BIT DOWN
COUNTER
WDL (C1H)
watchdog
oscillator
PCLK
÷32
MOV WFEED1, #0A5H
MOV WFEED2, #05AH
reset(1)
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| P89LPC935FHN | 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 8K FLASH HVQFN-28 制造商:NXP Semiconductors 功能描述:MCU 8BIT 80C51 8K FLASH, HVQFN-28 制造商:NXP Semiconductors 功能描述:P89LPC935FHN/HVQFN28/TRAYB// |
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