ht82k74e Holtek Semiconductor Inc., ht82k74e Datasheet - Page 28

• Manufacturer Part Number: ht82k74e
• Description: 27mhz Keyboard/ Mouse Tx 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

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.
Note:
Rev. 1.00
PCL
MP
ACC
TBLP
TBLH
STATUS
INTC
TMRL
TMRH
TMRC
PA
PAC
PB
PBC
PC
PCC
PD
PDC
PE
PEC
WSR
CTLR
OSCC
RFCTR
PTR
TBHP
Register
* means warm reset
- not implemented
u means unchanged
x means unknown
(Power-on)
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
0000 0000
0000 0000
0000 0000
0000 0000
0000 0x00
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
-xxx xxxx
--00 xxxx
00-0 1---
---- 1111
---- 1111
xxxx x---
--0- -0-0
Reset
000H
(Normal Operation)
WDT time-out
uuuu uuuu
uuuu uuuu
uuuu uuuu
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
0000 0x00
0000 0000
0000 0000
0000 0000
0000 0uuu
-uuu uuuu
--1u uuuu
xxxx xxxx
xxxx xxxx
00-0 1---
---- 1111
---- 1111
xxxx x---
--0- -0-0
000H
28
(Normal Operation)
RES Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
0000 0x00
0000 0000
0000 0000
0000 0000
0000 uuuu
-uuu uuuu
--00 uuuu
xxxx xxxx
xxxx xxxx
00-0 1---
---- 1111
---- 1111
xxxx x---
--0- -0-0
000H
HT82K74E/HT82K74EE
RES Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
1111 1111
0000 0000
0000 0000
0000 0000
0000 0uuu
0000 0x00
-uuu uuuu
--00 uuuu
xxxx xxxx
xxxx xxxx
00-0 1---
---- 1111
---- 1111
xxxx x---
--0- -0-0
(HALT)
000H
December 15, 2009
WDT Time-out
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uxuu
uuu0 uuuu
000u uuuu
uuuu uuuu
0000 0uuu
-uuu uuuu
--11 uuuu
uuuu u---
--u- -u-u
uu-u u---
---- uuuu
---- uuuu
(HALT)*
000H