HT45R36 Holtek Semiconductor, HT45R36 Datasheet - Page 13

• Manufacturer Part Number: HT45R36
• Description: C/R to F Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

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tine execution will be delayed by one or more cycles. If
the wake-up results in the next instruction execution,
this will be executed immediately after the dummy pe-
riod is finished.
To minimise power consumption, all the I/O pins should
be carefully managed before entering the Power Down
mode.
Reset
There are three ways in which a reset can occur:
A WDT time-out, when the device is in the Power Down
mode, is different from other device reset conditions, in
that it can perform a warm reset that resets only the
Program Counter and the SP, leaving the other circuits
in their original state. Some registers remain unchanged
during other reset conditions. Most registers are reset to
their initial condition when the reset conditions are
met. By examining the PDF and TO flags, the program
can distinguish between the different device reset types.
Note: u means unchanged
To guarantee that the system oscillator is started and
stabilised, the SST or System Start-up Timer, provides
an extra-delay of 1024 system clock pulses when the
system is reset (power-up, WDT time-out or RES reset)
or when the system awakens from a Power Down state.
When a system reset occurs, the SST delay is added
during the reset period. Any wake-up from HALT will en-
able the SST delay.
An extra option load time delay is added during a system
reset (power-up, WDT time-out at normal mode or RES
reset).
Rev. 1.00
TO PDF
RES reset during normal operation
RES reset during HALT
WDT time-out reset during normal operation
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 Conditions
13
Note:
The functional unit device reset status are shown below.
Program Counter
Interrupt
Prescaler
WDT
Timer/Event Counter Off
Input/Output Ports
Stack Pointer
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
Reset Circuit
000H
Disable
Clear
Clear. After master reset,
WDT begins counting
Input mode
Points to the top of the stack
September 28, 2006
HT45R36