HT49R50 Holtek Semiconductor Inc, HT49R50 Datasheet - Page 20

• Manufacturer Part Number: HT49R50
• Description: 8-Bit Microcontroller
• Manufacturer: Holtek Semiconductor Inc

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 system awakes from the HALT
state or during power up. Awaking from the
HALT state or system power-up, the SST delay is
added.
An extra SST delay is added during the
power-up period, and any wake-up from the
HALT may enable only the SST delay.
The functional unit chip reset status is shown
below.
PC
Interrupt
Prescaler, Divider
WDT, RTC, Time
base
Timer/event
counter
Input/output ports
SP
000H
Disabled
Cleared
Cleared. After master
reset, WDT starts
counting
Off
Points to the top of the
stack
Input mode
20
Reset configuration
Reset timing chart
August 18, 1999
HT49C50