HT46R52A Holtek Semiconductor, HT46R52A Datasheet - Page 12

• Manufacturer Part Number: HT46R52A
• Description: (HT46R51A / HT46R52A) A/D Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

www.DataSheet4U.com
DataSheet
4
U
.com
set conditions are met. Examining the PDF and TO
flags, the program can distinguish between different
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 re-
set occurs, the SST delay is added during the reset pe-
riod. Any wake-up from the HALT will enable the SST
delay. An extra option load time delay is added during
system reset (Power-up, WDT time-out at normal mode
or RES reset).
The functional unit chip reset status are shown below.
The register states are summarized below:
Rev. 1.00
chip resets .
Program Counter
Interrupt
Prescaler, Divider
WDT
Timer/Event Counter Off
Input/Output Ports
Stack Pointer
TMR
TMRC
Program
Counter
MP0
MP1
ACC
TBLP
TBLH
STATUS
INTC
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
Reset(Power On)
00-0 1000
-000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
--00 xxxx
0000H
RESET Conditions
000H
Disable
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
00-0 1000
-000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
--1u uuuu
0000H
(Normal Operation)
12
RES Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
00-0 1000
-000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
--uu uuuu
Note:
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
HT46R51A/HT46R52A
00-0 1000
-000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
--01 uuuu
Reset Circuit
(HALT)
0000H
WDT Time-out
August 24, 2006
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uu-u uuuu
--11 uuuu
-uuu uuuu
(HALT)*
0000H