HT46R01B/02B/01N/02N
HT48R01B/02B/01N/02N
Configuration Options
Configuration options refer to certain options within the MCU that are programmed into the OTP Program Memory de-
vice during the programming process. During the development process, these options are selected using the HT-IDE
software development tools. As these options are programmed into the device using the hardware programming tools,
once they are selected they cannot be changed later by the application software. All options must be defined for proper
system function, the details of which are shown in the table.
No.
Options
1
Watchdog Timer: enable or disable
Watchdog Timer clock source: LXT, LIRC or fSYS/4
2
Note: LXT oscillator must be selected by OSC configuration option if WDT clock source is from LXT.
3
4
5
6
7
8
9
CLRWDT instructions: 1 or 2 instructions
System oscillator configuration: HXT, HIRC, ERC, HIRC + LXT
LVR function: enable or disable
LVR voltage: 2.1V, 3.15V or 4.2V
RES or PA7 pin function
SST: 1024 or 2 clocks (determine tSST for HIRC/ERC)
Internal RC: 4MHz, 8MHz or 12MHz
Application Circuits
V
D
D
0
.
m
0
F
1
V
D
D
R
e
s
e
t
1
W
0 ~ k
C
i
r
c
u
i
t
1
0
W
0
k
1
N
4
1
4
8
0
m
. F 1
R
E
S
/
P
A
7
P
A
0
/
A
N
0
3
0
W
0
P
A
1
/
P
F
D
/
A
N
1
0
.
1
m
F
~
1
P
A
2
/
T
C
0
/
A
N
2
P
A
3
/
I
N
T
/
A
N
3
V
S
S
P
A
4
/
T
C
1
/
P
W
M
0
P
B
0
P
B
1
O
O
S
S
C
C
1
2
O
S
C
C
i
r
c
u
i
t
S
e
e
O
s
c
i
l
l
a
t
o
r
S
e
c
t
i
o
n
Rev.1.10
53
February 12, 2010
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
