- 您现在的位置：买卖IC网 > PDF目录69348 > ST6200CM6/XXX (STMICROELECTRONICS) 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO16 PDF资料下载
参数资料
| 型号： | ST6200CM6/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO16 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-16 |
| 文件页数： | 38/100页 |
| 文件大小： | 3849K |
| 代理商： | ST6200CM6/XXX |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页当前第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页
ST6200C ST6201C ST6203C
42/100
Doc ID 4563 Rev 5
WATCHDOG TIMER (Cont’d)
8.1.3 Functional Description
The watchdog activation is selected through an
option in the option bytes:
– HARDWARE Watchdog option
After reset, the watchdog is permanently active,
the C bit in the WDGR is forced high and the user
can not change it. However, this bit can be read
equally as 0 or 1.
– SOFTWARE Watchdog option
After reset, the watchdog is deactivated. The func-
tion is activated by setting C bit in the WDGR reg-
ister. Once activated, it cannot be deactivated.
The counter value stored in the WDGR register
(bits SR:T0), is decremented every 3072 clock cy-
cles. The length of the timeout period can be pro-
grammed by the user in 64 steps of 3072 clock cy-
cles.
If the watchdog is activated (by setting the C bit)
and when the SR bit is cleared, the watchdog initi-
ates a reset cycle pulling the reset pin low for typi-
cally 500ns.
The application program must write in the WDGR
register at regular intervals during normal opera-
tion to prevent an MCU reset. The value to be
stored in the WDGR register must be between
FEh and 02h (see Table 11). To run the watchdog
function the following conditions must be true:
– The C bit is set (watchdog activated)
– The SR bit is set to prevent generating an imme-
diate reset
– The T[5:0] bits contain the number of decre-
ments which represent the time delay before the
watchdog produces a reset.
Table 11. Watchdog Timing (fOSC = 8 MHz)
8.1.3.1 Software Reset
The SR bit can be used to generate a software re-
set by clearing the SR bit while the C bit is set.
8.1.4 Recommendations
1. The Watchdog plays an important supporting
role in the high noise immunity of ST62xx devices,
and should be used wherever possible. Watchdog
related options should be selected on the basis of
a trade-off between application security and STOP
mode availability (refer to the description of the
WDACT and EXTCNTL bits on the Option Bytes).
When STOP mode is not required, hardware acti-
vation without EXTERNAL STOP MODE CON-
TROL should be preferred, as it provides maxi-
mum security, especially during power-on.
When STOP mode is required, hardware activa-
tion and EXTERNAL STOP MODE CONTROL
should be chosen. NMI should be high by default,
to allow STOP mode to be entered when the MCU
is idle.
The NMI pin can be connected to an I/O line (see
Figure 26) to allow its state to be controlled by soft-
ware. The I/O line can then be used to keep NMI
low while Watchdog protection is required, or to
avoid noise or key bounce. When no more
processing is required, the I/O line is released and
the device placed in STOP mode for lowest power
consumption.
Figure 26. A typical circuit making use of the
EXERNAL STOP MODE CONTROL feature
2. When software activation is selected (WDACT
bit in Option byte) and the Watchdog is not activat-
ed, the downcounter may be used as a simple 7-
bit timer (remember that the bits are in reverse or-
der).
The software activation option should be chosen
only when the Watchdog counter is to be used as
a timer. To ensure the Watchdog has not been un-
expectedly activated, the following instructions
should be executed:
jrr 0, WDGR, #+3 ; If C=0,jump to next
ldi WDGR, 0FDH
; SR=0 -> reset
next :
WDGR Register
initial value
WDG timeout period
(ms)
Max.
FEh
24.576
Min.
02h
0.384
NMI
SWITCH
I/O
VR02002
1
相关PDF资料 |
PDF描述 |
|---|---|
| ST6203CN3/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO16 |
| ST6209CB1/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP20 |
| ST6220CB3/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP20 |
| ST6220CB6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP20 |
| ST6208CB1/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST6200CM-AUTO | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET |
| ST6200FNL | 制造商:Pulse Electronics Corporation 功能描述:TRANSFORMER - Bulk 制造商:Pulse Electronics Corporation 功能描述:XFRMR 1:1 SONET/SDH E4/STM-1 SMD |
| ST6200FNLT | 制造商:Pulse Electronics Corporation 功能描述:TRANSFORMER - Tape and Reel 制造商:Pulse Electronics Corporation 功能描述:XFRMR 1:1 SONET/SDH E4/STM-1 SMD |
| ST6200L | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW VOLTAGE 8-BIT ROM MCUs WITH A/D CONVERTER,AND 16 PINS |
| ST6200LB1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW VOLTAGE 8-BIT ROM MCUs WITH A/D CONVERTER,AND 16 PINS |
发布紧急采购，3分钟左右您将得到回复。