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SM39R08A5W10MP 参数 Datasheet PDF下载

SM39R08A5W10MP图片预览
型号: SM39R08A5W10MP
PDF下载: 下载PDF文件 查看货源
内容描述: SM39R08A5\n8位微控制器\n具有8KB闪存\n和256B RAM的嵌入式 [SM39R08A5 8-Bit Micro-controller with 8KB Flash & 256B RAM embedded]
分类和应用: 闪存微控制器
文件页数/大小: 56 页 / 2316 K
品牌: SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
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SM39R08A5  
8-Bit Micro-controller  
with 8KB Flash  
& 256B RAM embedded  
Mnemonic: RSTS  
Address: A1h  
7
-
6
-
5
-
4
3
2
1
0
Reset  
00H  
PDRF WDTF SWRF LVRF  
PORF  
WDTF: Watchdog timer reset flag.  
When MCU is reset by watchdog, WDTF flag will be set to one by hardware. This flag  
clear by software.  
Mnemonic: WDTC  
Address: B6h  
7
-
6
5
4
-
3
2
1
0
Reset  
04H  
CWDTR WDTE  
WDTM [3:0]  
CWDTR: 0: watchdog reset  
1: watchdog interrupt  
WDTE: Control bit used to enable Watchdog timer.  
The WDTE bit can be used only if WDTEN, the bit7 of information block OP3, is "0". If  
the WDTEN bit is "0", then WDT can be disabled / enabled by the WDTE bit.  
0: Disable WDT.  
1: Enable WDT.  
The WDTE bit is not used if WDTEN, the bit7 of information block OP3, is "1". That is, if  
the WDTEN bit is "1", WDT is always disabled no matter what the WDTE bit status is.  
The WDTE bit can be read and written.  
WDTM [3:0]: WDT clock source divider bit. Please see table 7.8.1 to reference the WDT time-out  
period.  
Mnemonic: WDTK  
Address: B7h  
7
6
5
4
3
2
1
0
Reset  
00h  
WDTK[7:0]  
WDTK: Watchdog timer refresh key.  
A programmer must write 0x55 into WDTK register, and then the watchdog  
timer will be cleared to zero.  
For example, if enable WDT and select time-out reset period is 2.8493s.  
First, programming the information block OP3 bit7 WDTEN to “0”.  
Secondly,  
MOV TAKEY, #55h  
MOV TAKEY, #AAh  
MOV TAKEY, #5Ah  
MOV WDTC, #28h  
; enable WDTC write attribute.  
; Set WDTM [3:0] = 1000b. Set WDTE =1 to enable WDT  
; function.  
.
.
.
MOV WDTK, #55h  
; Clear WDT timer to 0.  
Specifications subject to change without notice contact your sales representatives for the most recent information.  
ISSFD-M067 Ver B SM39R08A5 04/22/2013  
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