參數(shù)資料
型號(hào)： HT48RA0A
廠商： Holtek Semiconductor Inc.
英文描述： 8-Bit Remote Type MCU
中文描述： 8位遙控型單片機(jī)
文件頁(yè)數(shù)： 8/31頁(yè)
文件大?。?/td> 328K
代理商： HT48RA0A
HT48RA0A
Rev. 1.70
8
July 16, 2003
Reset
Therearethreewaysinwhicharesetcanoccur:
RES reset during normal operation
RES reset during HALT
WDT time-out reset during normal operation
Some registers remain unchanged during reset condi-
tions. Most registers are reset to the initial condition
when the reset conditions are met. By examining the PD
and TO flags, the program can distinguish between dif-
ferent chip resets .
TO
PD
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
Note: u
means unchanged.
To guarantee that the system oscillator has started and
stabilized, the SST (System Start-up Timer) provides an
extra-delay of 1024 system clock pulses when the sys-
tem powers up or when the system awakes from a HALT
state.
Whenasystempowerupoccurs,anSSTdelayisadded
during the reset period. But when the reset comes from
the RES pin, the SST delay is disabled. Any wake-up
from HALT will enable the SST delay.
The functional unit chip reset status is shown below.
PC
000H
WDT Prescaler
Clear
Input/Output ports
Input mode
SP
Points to the top of the stack
Carrier output
Low level
+
+
:
=
A
:
#
$ :
0 #
Reset configuration
Reset circuit
#
:
! # #
Reset timing chart
The chip reset status of the registers is summarized in the following table:
Register
Reset
(Power On)
WDT Time-out
(Normal Operation)
RES Reset
(Normal Operation)
RES Reset
(HALT)
PC (Program Counter)
000H
000H
000H
000H
MP
-xxx xxxx
-uuu uuuu
-uuu uuuu
-uuu uuuu
ACC
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
TBLP
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
TBLH
--xx xxxx
--uu uuuu
--uu uuuu
--uu uuuu
STATUS
--00 xxxx
--1u uuuu
--uu uuuu
--01 uuuu
PA
1111 1111
1111 1111
1111 1111
1111 1111
PB
1111 1111
1111 1111
1111 1111
1111 1111
PC
---- ---1
---- ---1
---- ---1
---- ---1
Note:
u
means unchanged
x
means unknown
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