參數(shù)資料
型號(hào): HT82M9AEE
廠商: Holtek Semiconductor Inc.
英文描述: USB Mouse Encoder 8-Bit MCU with EEPROM
中文描述: USB鼠標(biāo)編碼器8位微控制器帶有EEPROM
文件頁(yè)數(shù): 13/48頁(yè)
文件大?。?/td> 330K
代理商: HT82M9AEE
HT82M9AEE/HT82M9AAE
Rev. 1.20
13
August 13, 2007
Reset
Therearefourwaysinwhicharesetcanoccur:
RES reset during normal operation
RES reset during HALT
WDT time-out reset during normal operation
USB reset
The WDT time-out during HALT is different from other
chip reset conditions, since it can perform a warm re -
set thatresetsonlytheprogramcounterandSP,leaving
the other circuits in their original state. Some registers
remain unchanged during other reset conditions. Most
registers are reset to the initial condition when the re-
set conditions are met. By examining the PDF and TO
flags, the program can distinguish between different
chip resets .
TO PDF
RESET Conditions
0
0
RES reset during power-up
u
u
RES reset during normal operation
0
0
RES wake-up HALT
1
u
WDT time-out during normal operation
1
1
WDT wake-up HALT
Note: u stands for unchanged
To guarantee that the system oscillator is started and
stabilized, the SST (System Start-up Timer) provides an
extra delay of 1024 system clock pulses when the sys-
tem resets (power-up, WDT time-out or RES reset) or
the system awakes from the HALT state.
When a system reset occurs, the SST delay is added
during the reset period. Any wake-up from HALT will en-
able the SST delay.
The functional unit chip reset status are shown below.
Program Counter
000H
Interrupt
Disable
Prescaler
Clear
WDT
Clear. After master reset,
WDT begins counting
Timer/event Counter
Off
Input/output Ports
Input mode
Stack Pointer
Points to the top of the stack
Reset Circuit
+
(
"
+
, #
"
! "
(
"
3 1 >
(
,
Reset Configuration
(
1
$
( (
"
Reset Timing Chart
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