HT49CV5 Holtek Semiconductor, HT49CV5 Datasheet - Page 16

• Manufacturer Part Number: HT49CV5
• Description: A/D
• Manufacturer: Holtek Semiconductor

The reset flags are shown in the table:
Note: u stands for unchanged
To ensure that the system oscillator is started and stabi-
lized, the SST (System Start-up Timer) provides an ex-
tra delay of 1024 system clock pulses when the system
awakes from the HALT state or during power-on.
An extra SST delay is added during the power-on pe-
riod, and any wake-up from HALT may enable only the
SST delay.
The functional unit chip reset status is shown below.
The register states are summarized below:
Rev. 1.20
Program Counter
Interrupt
Prescaler, Divider
WDT
Timer/Event Counter Off
Input/Output Ports
Stack Pointer
TMR0H
TMR0L
TMR0C
TMR1H
TMR1L
TMR1C
Program
Counter
MP0
MP1
BP
ACC
TBLP
TBLH
STATUS
TO PDF
Register
0
u
0
1
1
0
u
1
u
1
RES reset during power-up
RES reset during normal operation
RES Wake-up HALT
WDT time-out during normal operation
WDT Wake-up HALT
(Power-on)
00-0 1000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
0000 1---
xxxx xxxx
xxxx xxxx
--00 xxxx
--0- -000
0000H
Reset
RESET Conditions
000H
Disabled
Cleared
Clear. After master reset,
WDT begins counting
Input mode
Points to the top of the stack
(Normal Operation)
WDT Time-out
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
00-0 1000
--1u uuuu
0000 1---
--0- -000
0000H
(Normal Operation)
16
RES Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
00-0 1000
Note:
--uu uuuu
0000 1---
--0- -000
0000H
nected to the RES pin as short as possible, to
avoid noise interference.
* Make the length of the wiring, which is con-
Reset Configuration
Reset Timing Chart
RES Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
00-0 1000
Reset Circuit
--01 uuuu
0000 1---
--0- -000
(HALT)
0000H
HT49RV5/HT49CV5
WDT Time-out
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uu-u uuuu
--11 uuuu
uuuu u---
--u- -uuu
(HALT)*
April 14, 2006
0000H