參數(shù)資料
型號： HT48RA1
廠商： Holtek Semiconductor Inc.
英文描述： Remote Type 8-Bit MCU
中文描述： 遠程型8位微控制器
文件頁數(shù)： 12/39頁
文件大?。?/td> 308K
代理商： HT48RA1
HT48RA1/HT48CA1
Rev. 1.00
12
June 25, 2004
The port A wake-up and interrupt methods can be con-
sidered as a continuation of normal execution. Each bit
in port A can be independently selected to wake up the
devicebymaskoption.AwakeningfromanI/Oportstim-
ulus, the program will resume execution of the next in-
struction. If it awakens from an interrupt, two sequence
may occur. If the related interrupt is disabled or the inter-
rupt is enabled but the stack is full, the program will re-
sume execution at the next instruction. If the interrupt is
enabled and the stack is not full, the regular interrupt re-
sponse takes place. If an interrupt request flag is set to
1 before entering the HALT mode, the wake-up func-
tion of the related interrupt will be disabled. Once a
wake-up event occurs, it takes 1024 t
SYS
(system clock
period) to resume normal operation. In other words, a
dummy period will be inserted after a wake-up. If the
wake-up results from an interrupt acknowledge signal,
the actual interrupt subroutine execution will be delayed
by one or more cycles. If the wake-up results in the next
instruction execution, this will be executed immediately
after the dummy period is finished.
To minimize power consumption, all the I/O pins should
be carefully managed before entering the HALT status.
Reset
Therearethreewaysinwhicharesetcanoccur:
RES reset during normal operation
RES reset during HALT
WDT time-out reset during normal operation
The WDT time-out during HALT is different from other
chip reset conditions, since it can perform a warm re -
set thatresetsonlythePCandSP,leavingtheothercir-
cuits in their original state. Some registers remain un-
changed during other reset conditions. Most registers
are reset to the initial condition when the reset condi-
tions are met. By examining the PDF and TO flags, the
programcandistinguishbetweendifferent chipresets .
TO
PDF
RESET Conditions
0
0
RES reset during power-up
u
u
RES reset during normal operation
0
1
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 reset (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.
PC
000H
Interrupt
Disable
Prescaler
Clear
WDT
Clear. After master reset,
WDT begins counting
Timer/event Counter
Off
Input/output Ports
Input mode
SP
Points to the top of the stack
*
4 , '
9 % ( *
1 , + 4 4
*
Reset Timing Chart
;
;
C
D
C
D
Reset Circuit
Note:
* Make the length of the wiring, which is con-
nected to the RES pin as short as possible, to
avoid noise interference.
3
! ' 4
*
3
=
0
% " /
*
.
* ' 4
*
9 < , * 4
, + + "
% ( ) *
Reset Configuration
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HT48RA1_07 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU
HT48RA1_09 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU
HT48RA3 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:HT48RA3/HT48CA3
HT48RA3_07 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU
HT48RA3_09 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:HT48RA3/HT48CA3
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