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參數資料
型號： W77LE532
廠商： WINBOND ELECTRONICS CORP
元件分類： 8位微控制器
英文描述： 8 BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁數： 44/85頁
文件大小： 2458K
代理商： W77LE532
Preliminary W77LE532
- 44 -
12. RESET STATE
Most of the SFRs and registers on the device will go to the same condition in the reset state. The
Program Counter is forced to 0000h and is held there as long as the reset condition is applied.
However, the reset state does not affect the on-chip RAM. The data in the RAM will be preserved
during the reset. However, the stack pointer is reset to 07h, and therefore the stack contents will be
lost. The RAM contents will be lost if the V
DD
falls below approximately 2V, as this is the minimum
voltage level required for the RAM to operate normally. Therefore after a first time power on reset the
RAM contents will be indeterminate. During a power fail condition, if the power falls below 2V, the
RAM contents are lost.
After a reset most SFRs are cleared. Interrupts and Timers are disabled. The Watchdog timer is
disabled if the reset source was a POR. The port SFRs have FFh written into them which puts the port
pins in a high state. Port 0 floats as it does not have on-chip pull-ups.
Table 6. SFR Reset Value
SFR Name
Reset Value
SFR Name
Reset Value
P0
11111111b
IE
00000000b
SP
00000111b
SADDR
00000000b
DPL
00000000b
P3
11111111b
DPH
00000000b
IP
x0000000b
DPL1
00000000b
SADEN
00000000b
DPH1
00000000b
T2CON
00000000b
DPS
00000000b
T2MOD
00000x00b
PCON
00xx0000b
RCAP2L
00000000b
TCON
00000000b
RCAP2H
00000000b
TMOD
00000000b
TL2
00000000b
TL0
00000000b
TH2
00000000b
TL1
00000000b
TA
11111111b
TH0
00000000b
PSW
00000000b
TH1
00000000b
WDCON
0x0x0xx0b
CKCON
00000001b
ACC
00000000b
xxx
00000b
P1
11111111b
EIE
P4CONA
00000000b
P4CONB
00000000b
P40AL
00000000b
P40AH
00000000b
P41AL
00000000b
P41AH
00000000b
P42AL
00000000b
P42AH
00000000b
P43Al
00000000b
P43AH
00000000b
CHPCON
00000000b
P4CSIN
00000000b
ROMCON
00000111b
SFRAL
00000000b
SFRAH
00000000b
SFRFD
00000000b
SFRCN
00111111b
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