HT46R01B/02B/01N/02N
HT48R01B/02B/01N/02N
The following table indicates the way in which the various components of the microcontroller are affected after a
power-on reset occurs.
Item
Program Counter
Interrupts
Condition After RESET
Reset to zero
All interrupts will be disabled
WDT
Clear after reset, WDT begins counting
Timer/Event Counter Timer Counter will be turned off
Prescaler
The Timer Counter Prescaler will be cleared
Input/Output Ports
Stack Pointer
I/O ports will be setup as inputs
Stack Pointer will point to the top of the stack
The different kinds of resets all affect the internal registers of the microcontroller in different ways. To ensure reliable
continuation of normal program execution after a reset occurs, it is important to know what condition the microcontroller
is in after a particular reset occurs. The following table describes how each type of reset affects each of the
microcontroller internal registers.
HT46R01B/HT46R02B/HT46R01N/HT46R02N
Power-on
Reset
RES or LVR
Reset
WDT Time-out
WDT Time-out
(Sleep)
Register
(Normal Operation)
PCL
MP0
MP1
ACC
0 0 0 0 0 0 0 0
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
- x x x x x x x
- - - - - 1 1 1
- - 0 0 x x x x
- 0 0 0 0 0 0 0
- - 0 0 - - 0 0
x x x x x x x x
0 0 0 0 1 0 0 0
x x x x x x x x
0 0 0 0 1 - - -
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0
- 0 0 0 0 0 0 0
- - - - - - 1 1
- - - - - - 1 1
- - - - - - 0 0
- 0 0 - 0 0 0 0
1 0 0 0 1 0 1 0
x x x x x x x x
0 0 0 0 0 0 0 0
u u u u u u u u
u u u u u u u u
u u u u u u u u
u u u u u u u u
- u u u u u u u
- - - - - 1 1 1
- - u u u u u u
- 0 0 0 0 0 0 0
- - 0 0 - - 0 0
x x x x x x x x
0 0 0 0 1 0 0 0
x x x x x x x x
0 0 0 0 1 - - -
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0
- 0 0 0 0 0 0 0
- - - - - - 1 1
- - - - - - 1 1
- - - - - - 0 0
- 0 0 - 0 0 0 0
1 0 0 0 1 0 1 0
x x x x x x x x
0 0 0 0 0 0 0 0
u u u u u u u u
u u u u u u u u
u u u u u u u u
u u u u u u u u
- u u u u u u u
- - - - - 1 1 1
- - 1 u u u u u
- 0 0 0 0 0 0 0
- - 0 0 - - 0 0
x x x x x x x x
0 0 0 0 1 0 0 0
x x x x x x x x
0 0 0 0 1 - - -
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0
- 0 0 0 0 0 0 0
- - - - - - 1 1
- - - - - - 1 1
- - - - - - 0 0
- 0 0 - 0 0 0 0
1 0 0 0 1 0 1 0
x x x x x x x x
0 0 0 0 0 0 0 0
u u u u u u u u
u u u u u u u u
u u u u u u u u
u u u u u u u u
- u u u u u u u
- - - - - u u u
- - 1 1 u u u u
- u u u u u u u
- - u u - - u u
u u u u u u u u
u u u u u u u u
u u u u u u u u
u u u u u - - -
u u u u u u u u
u u u u u u u u
u u u u u u u u
- u u u u u u u
- - - - - - u u
- - - - - - u u
- - - - - - u u
- u u - u u u u
u u u u u u u u
u u u u u u u u
TBLP
TBLH
WDTS
STATUS
INTC0
INTC1
TMR0
TMR0C
TMR1
TMR1C
PA
PAC
PAWK
PAPU
PB
PBC
PBPU
CTRL0
CTRL1
PWM0
Rev.1.10
27
February 12, 2010
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
