ht82a523r Holtek Semiconductor Inc., ht82a523r Datasheet - Page 13

• Manufacturer Part Number: ht82a523r
• Description: Ht82a523r -- Usb 2.0 Full Speed 8-bit Otp Mcu
• Manufacturer: Holtek Semiconductor Inc.

Note: u stands for unchanged
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 awakes from the HALT state or during power up.
Awaking from the HALT state or system power up, an
SST delay is added. An extra SST delay is added during
power up period, and any wake-up from HALT may en-
able only the SST delay.
The registers states are summarized in the following table.
Rev. 1.30
MP0
MP1
ACC
Program
Counter
TBLP
TBLH
STATUS
INTC0
TMR0
TO PDF
Register
0
u
0
1
1
0
u
1
u
1
RES reset during power-up
RES reset during normal operation
RES wake-up at HALT
WDT time-out during normal operation
WDT wake-up at HALT
(Power On)
-xxxx xxxx
-000 0000
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
--00 xxxx
xxxx xxxx
Reset Configuration
Reset
000H
RESET Conditions
Operation)
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
-uuu uuuu
-000 0000
--1u uuuu
Time-out
(Normal
WDT
000H
RES Reset
Operation)
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
-uuu uuuu
-000 0000
--uu uuuu
(Normal
000H
13
RES Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
0000 0000
-uuu uuuu
-000 0000
--00 uuuu
(HALT)
The functional unit chip reset status are shown below.
000H
Note:
Program Counter
Interrupt
Prescaler, Divider
WDT
Timer/event Counter
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-
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
-uuu uuuu
Time-out
--11 uuuu
-uuu uuuu
(HALT)*
000H
WDT
Reset Timing Chart
Reset Circuit
000H
Disable
Cleared
Clear. After master reset,
WDT begins counting
Off
Input mode
Points to the top of the stack
USB Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
-uuu uuuu
-000 0000
--uu uuuu
(Normal)
000H
HT82A523R
May 13, 2008
USB Reset
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
-uuu uuuu
-000 0000
--01 uuuu
(HALT)
000H