參數(shù)資料
型號(hào): P87LPC764FDH,512
廠商: NXP Semiconductors
文件頁(yè)數(shù): 38/60頁(yè)
文件大?。?/td> 0K
描述: IC 80C51 MCU 4KB OTP 20TSSOP
標(biāo)準(zhǔn)包裝: 75
系列: LPC700
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,LED,POR,WDT
輸入/輸出數(shù): 18
程序存儲(chǔ)器容量: 4KB(4K x 8)
程序存儲(chǔ)器類(lèi)型: OTP
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-TSSOP(0.173",4.40mm 寬)
包裝: 管件
Philips Semiconductors
Product data
P87LPC764
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
2003 Sep 03
42
SU01754
WATCHDOG
INTERRUPT
S
Q
20-BIT COUNTER
STATE CLOCK
WDTE (UCFG1.7)
BOF (PCON.5)
POF (PCON.4)
WATCHDOG
RESET
CLEAR
8 MSBs
8 TO 1 MUX
WATCHDOG
FEED DETECT
WDOVF
(WDCON.5)
WDS2–0
(WDCON.2–0)
WDTE + WDRUN
WDCLK * WDTE
500 kHz
RC OSCILLATOR
ENABLE
CLOCK OUT
R
Figure 33. Block Diagram of the Watchdog Timer
BIT
SYMBOL
FUNCTION
WDCON.7, 6
Reserved for future use. Should not be set to 1 by user programs.
WDCON.5
WDOVF
Watchdog timer overflow flag. Set when a watchdog reset or timer overflow occurs. Cleared when
the watchdog is fed.
WDCON.4
WDRUN
Watchdog run control. The watchdog timer is started when WDRUN = 1 and stopped when
WDRUN = 0. This bit is forced to 1 (watchdog running) if the WDTE configuration bit = 1.
WDCON.3
WDCLK
Watchdog clock select. The watchdog timer is clocked by CPU clock/6 when WDCLK = 1 and by
the watchdog RC oscillator when WDCLK = 0. This bit is forced to 0 (using the watchdog RC
oscillator) if the WDTE configuration bit = 1.
WDCON.2–0 WDS2–0
Watchdog rate select.
WDS2–0
Timeout Clocks
Minimum Time
Nominal Time
Maximum Time
0 0 0
8,192
10 ms
25 ms
40 ms
0 0 1
16,384
20 ms
50 ms
80 ms
0 1 0
32,768
41 ms
100 ms
160 ms
0 1 1
65,536
82 ms
200 ms
320 ms
1 0 0
131,072
165 ms
400 ms
640 ms
1 0 1
262,144
330 ms
800 ms
1280 ms
1 1 0
524,288
660 ms
1.60 sec
2.60 sec
1 1 1
1,048,576
1.3 sec
3.20 sec
5.30 sec
WDS0
SU01476
WDS1
WDS2
WDCLK
WDRUN
WDOVF
0
1
2
3
4
5
6
7
WDCON
Reset Value:
S 30h for a watchdog reset.
S 10h for other rest sources if the watchdog is enabled via the WDTE configuration bit.
S 00h for other reset sources if the watchdog is disabled via the WDTE configuration bit.
Not Bit Addressable
Address: A7h
Figure 34. Watchdog Timer Control Register (WDCON)
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