參數(shù)資料
型號(hào)： M37517F8HP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PQFP48
封裝： 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁(yè)數(shù)： 42/98頁(yè)
文件大?。?/td> 886K
代理商： M37517F8HP
Rev.1.01
Aug 02, 2004
page 47 of 96
7517 Group
WATCHDOG TIMER
The watchdog timer gives a mean of returning to the reset status
when a program cannot run on a normal loop (for example, be-
cause of a software run-away). The watchdog timer consists of an
8-bit watchdog timer L and an 8-bit watchdog timer H.
Standard Operation of Watchdog Timer
When any data is not written into the watchdog timer control reg-
ister (address 003916) after resetting, the watchdog timer is in the
stop state. The watchdog timer starts to count down by writing an
optional value into the watchdog timer control register (address
003916) and an internal reset occurs at an underflow of the watch-
dog timer H.
Accordingly, programming is usually performed so that writing to
the watchdog timer control register (address 003916) may be
started before an underflow. When the watchdog timer control reg-
ister (address 003916) is read, the values of the high-order 6 bits
of the watchdog timer H, STP instruction disable bit, and watch-
dog timer H count source selection bit are read.
qInitial value of watchdog timer
At reset or writing to the watchdog timer control register (address
003916), each watchdog timer H and L is set to “FF16”.
Fig. 52 Structure of Watchdog timer control register
qWatchdog timer H count source selection bit operation
Bit 7 of the watchdog timer control register (address 003916) per-
mits selecting a watchdog timer H count source. When this bit is
set to “0”, the count source becomes the underflow signal of
watchdog timer L. The detection time is set to 131.072 ms at f(XIN)
= 8 MHz frequency and 32.768 s at f(XCIN) = 32 kHz frequency.
When this bit is set to “1”, the count source becomes the signal
divided by 16 for f(XIN) (or f(XCIN)). The detection time in this case
is set to 512
s at f(XIN) = 8 MHz frequency and 128 ms at f(XCIN)
= 32 kHz frequency. This bit is cleared to “0” after resetting.
qOperation of STP instruction disable bit
Bit 6 of the watchdog timer control register (address 003916) per-
mits disabling the STP instruction when the watchdog timer is in
operation.
When this bit is “0”, the STP instruction is enabled.
When this bit is “1”, the STP instruction is disabled, once the STP
instruction is executed, an internal reset occurs. When this bit is
set to “1”, it cannot be rewritten to “0” by program. This bit is
cleared to “0” after resetting.
Fig. 51 Block diagram of Watchdog timer
XIN
Data bus
XCIN
“10”
“00”
“01”
Main clock division
ratio selection bits
(Note)
“0”
“1”
1/16
Watchdog timer H count
source selection bit
Reset
circuit
STP instruction disable bit
Watchdog timer H (8)
“FF16” is set when
watchdog timer
control register is
written to.
Internal reset
RESET
Watchdog timer L (8)
Note: Any one of high-speed, middle-speed or low-speed mode is selected by bits 7 and 6 of the CPU mode register.
STP instruction
“FF16” is set when
watchdog timer
control register is
written to.
b0
STP instruction disable bit
0: STP instruction enabled
1: STP instruction disabled
Watchdog timer H count source selection bit
0: Watchdog timer L underflow
1: f(XIN)/16 or f(XCIN)/16
Watchdog timer H (for read-out of high-order 6 bit)
Watchdog timer control register
(WDTCON : address 003916)
b7
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參數(shù)描述
M37530T-PTC 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Converter for Connecting 42-pin 1.778mm-pitch SDIP to a 40-pin Narrow-pitch Connector (for 7531, 7540, 7542 and 7544 Groups)
M37530T-PTCB 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Converter for Connecting 40-pin Narrow-pitch Connector to 32-pin 0.8mm-pitch LQFP (for 7531, 7532, 7534, 7540, 7542 and 7544 Groups)
M37530T-PTCC 功能描述:DEV 42-PIN RSS/MCU TO 32-PIN 1.7 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 配件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 附件類型:適配器板 適用于相關(guān)產(chǎn)品:RCB230，RCB231，RCB212 配用:26790D-ND - RCB BREAKOUT BOARD RS232 CABLE
M37531E4FP 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
M37531E4FP#U0 制造商:Renesas Electronics Corporation 功能描述:MITSUBISHI 8 BIT OTP MCU
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