ht82k94e Holtek Semiconductor Inc., ht82k94e Datasheet - Page 13

• Manufacturer Part Number: ht82k94e
• Description: Ht82k94e/ht82k94a -- Usb Multimedia Keyboard Encoder 8-bit Mcu
• 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 sys-
tem resets (power-up, WDT time-out or RES reset) or
when the system awakes from the HALT state.
When a system reset occurs, an SST delay is added
during the reset period. Any wake-up from HALT will en-
able the SST delay.
The status of the registers are summarized in the following table.
Rev. 1.90
TMR0
TMR0C
TMR1H
TMR1L
TMR1C
Program
Counter
MP0
MP1
ACC
TBLP
TBLH
STATUS
INTC
WDTS
PA
PAC
PB
Register
(Power On)
1000 0111
1111 1111
1111 1111
1111 1111
00-0 1000
-000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
Reset Timing Chart
-xxx xxxx
--00 xxxx
xxxx xxxx
00-0 1---
Reset
000H
Reset Circuit
Operation)
0000 0000
0000 0000
0000 0000
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
1000 0111
1111 1111
1111 1111
1111 1111
00-0 1000
-uuu uuuu
-000 0000
--1u uuuu
Time-out
00-0 1---
(Normal
WDT
000H
RES Reset
Operation)
0000 0000
0000 0000
0000 0000
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
1000 0111
1111 1111
1111 1111
1111 1111
00-0 1000
-uuu uuuu
-000 0000
--uu uuuu
(Normal
00-0 1---
000H
13
RES Reset
0000 0000
0000 0000
0000 0000
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
1000 0111
1111 1111
1111 1111
1111 1111
00-0 1000
-uuu uuuu
-000 0000
--00 uuuu
00-0 1---
The functional unit chip reset status are shown below.
(HALT)
Program Counter
Interrupt
Prescaler
WDT
Timer/event Counter Off
Input/output Ports
Stack Pointer
000H
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uu-u uuuu
-uuu uuuu
-uuu uuuu
uuuu uuuu
Time-Out
--11 uuuu
uu-u u---
(HALT)*
000H
WDT
Reset Configuration
HT82K94E/HT82K94A
000H
Disable
Clear
Clear. After master reset,
WDT begins counting
Input mode
Points to the top of the stack
USB-Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
1000 0111
1111 1111
1111 1111
1111 1111
00-0 1000
-uuu uuuu
-000 0000
--uu uuuu
(Normal)
00-0 1---
000H
April 29, 2008
USB-Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
1000 0111
1111 1111
1111 1111
1111 1111
00-0 1000
-uuu uuuu
-000 0000
--01 uuuu
00-0 1---
(HALT)
000H