HT46R068B/HT46R069B
Enhanced A/D Type 8-bit OTP MCU
Reset Initial Conditions
The different types of reset described affect the reset flags in different ways. These flags, known
as PDF and TO are located in the status register and are controlled by various microcontroller
operations, such as the Idle/Sleep function or Watchdog Timer. The reset flags are shown in the
table:
TO
0
ꢀ
1
1
PDF
RESET Conditions
0
ꢀ
ꢀ
1
Poweꢁ-on ꢁeset
RES oꢁ LVR ꢁeset dꢀꢁing Noꢁmal oꢁ Slow Mode opeꢁation
WDT time-oꢀt ꢁeset dꢀꢁing Noꢁmal oꢁ Slow Mode opeꢁation
WDT time-oꢀt ꢁeset dꢀꢁing Idle oꢁ Sleep Mode opeꢁation
Note: "u" stands for unchanged
The following table indicates the way in which the various components of the microcontroller are
affected after a power-on reset occurs.
Item
Pꢁogꢁam Coꢀnteꢁ
Inteꢁꢁꢀpts
Condition After RESET
Reset to zeꢁo
All inteꢁꢁꢀpts will be disabled
WDT
Cleaꢁ afteꢁ ꢁesetꢅ WDT begins coꢀnting
Timeꢁ Coꢀnteꢁ will be tꢀꢁned off
The Timeꢁ Coꢀnteꢁ Pꢁescaleꢁ will be cleaꢁed
I/O poꢁts will be setꢀp as inpꢀts
Timeꢁ/Event Coꢀnteꢁ
Pꢁescaleꢁ
Inpꢀt/Oꢀtpꢀt Poꢁts
Stack Pointeꢁ
Stack Pointeꢁ 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.
RES or LVR
Reset
(Normal
RES or LVR
Reset
(Idle/Sleep)
WDT Time-out
(Normal
Operation)
Power-on
Reset
WDT Time-out
(Idle/Sleep)
Register
Operation)
●
●
●
●
●
●
●
PCL
MP0
0 0 0 0 0 0 0 0
x x x x x x x x
x x x x x x x x
– – 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
– – – – – 1 1 1
– – 0 0 x x x x
– 0 0 0 0 0 0 0
– 0 – 0 – 0 – 0
– 0 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 – – –
x x x x x x x x
0 0 0 0 0 0 0 0
x x x x x x x x
x x x x x x x x
– – 0 – – – 0 0
– 0 0 – – 0 0 0
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
– – – – – 1 1 1
– – ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
– 0 0 0 0 0 0 0
– 0 – 0 – 0 – 0
– 0 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 – – –
x x x x x x x x
0 0 0 0 0 0 0 0
x x x x x x x x
x x x x x x x x
– – 0 – – – 0 0
– 0 0 – – 0 0 0
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
– – – – – 1 1 1
– – 0 1 ꢀ ꢀ ꢀ ꢀ
– 0 0 0 0 0 0 0
– 0 – 0 – 0 – 0
– 0 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 – – –
x x x x x x x x
0 0 0 0 0 0 0 0
x x x x x x x x
x x x x x x x x
– – 0 – – – 0 0
– 0 0 – – 0 0 0
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
– – – – – 1 1 1
– – 1 ꢀ ꢀ ꢀ ꢀ ꢀ
– 0 0 0 0 0 0 0
– 0 – 0 – 0 – 0
– 0 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 – – –
x x x x x x x x
0 0 0 0 0 0 0 0
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
– – ꢀ – – – ꢀ ꢀ
– ꢀ ꢀ – – ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
– – – – – ꢀ ꢀ ꢀ
– – 1 1 ꢀ ꢀ ꢀ ꢀ
– ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
– ꢀ – ꢀ – ꢀ – ꢀ
– ꢀ ꢀ ꢀ – ꢀ ꢀ ꢀ
– ꢀ ꢀ ꢀ – ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
ꢀ ꢀ ꢀ ꢀ ꢀ – – –
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ
MP1
BP
●
●
●
●
●
●
●
BP
●
●
●
●
●
●
ACC
TBLP
TBLH
WDTS
STATUS
INTC0
INTC1
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MFIC
TMR0
TMR0C
TMR1
TMR1C
TMRꢃL
Rev. 1.00
39
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HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
