HT46C47 Holtek Semiconductor, HT46C47 Datasheet - Page 13

• Manufacturer Part Number: HT46C47
• Description: (HT46C46 / HT46C47) Cost-Effective A/D Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

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 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 system
reset (power-up, WDT time-out at normal mode or RES
reset).
The functional unit chip reset status are shown below.
Rev. 1.00
Program Counter
Interrupt
WDT
Timer/Event Counter Off
Input/Output Ports
SP
Reset Timing Chart
000H
Disable
Clear. After master reset,
WDT begins counting
Input mode
Points to the top of the stack
HT46R46/HT46C46/HT46R47/HT46C47
13
Note:
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 Circuit
December 28, 2004