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| 型號： | HT95L000 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | LCD Type Phone 8-Bit MCU |
| 中文描述： | 液晶式電話8位微控制器 |
| 文件頁數(shù)： | 16/52頁 |
| 文件大小： | 364K |
| 代理商： | HT95L000 |
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HT95LXXX
Rev. 1.20
16
May 26, 2004
The WDT OSC period is 78 s. This time-out period may
vary with temperature, VDD and process variations. The
WDT OSC always works for any operation mode.
If the instruction clock is selected as the WDT clock
source,theWDToperatesinthesamemannerexceptin
the Sleep mode or Idle mode. In these two modes, the
WDT stops counting and lose its protecting purpose. In
this situation the logic can only be re-started by external
logic.
If the WDT clock source is the 32768Hz, the WDT also
operates in the same manner except in the Idle mode.
When in the Idle mode, the 32768Hz stops, the WDT
stops counting and lose its protecting purpose. In this
situation the logic can only be re-started by external
logic.
The high nibble and bit3 of the WDTS are reserved for
user defined flags, which can be used to indicate some
specified status.
The WDT time-out under Normal mode or Green mode
will initialize chip reset and set the status bit TO . But
in the Sleep mode or Idle mode, the time-out will initial-
ize a warm reset and only the program counter and
stack pointer are reset to 0. To clear the WDT contents
(including the WDT prescaler), three methods are
adopted; external reset (a low level to RES pin), soft-
ware instruction and a HALT instruction.
The software instruction include CLR WDT and the
other set CLR WDT1 and CLR WDT2 . Of these two
types of instruction, only one can be active depending
on the mask option WDTinstr . If the CLR WDT is se-
lected (i.e. One clear instruction), any execution of the
CLR WDTinstruction will clear the WDT. In the case that
CLR WDT1 and CLR WDT2 are chosen (i.e. Two
clear instructions), these two instructions must be exe-
cuted to clear the WDT; otherwise, the WDT may reset
the chip as a result of time-out.
Controller Operation Mode
Holtek s telephone controllers support two system clock
and four operation modes. The system clock could be
32768Hz or 3.58MHz and operation mode could be Nor-
mal, Green, Sleep or Idle mode. These are all selected
by the software.
The following conditions will force the operation mode to
change to Green mode:
Any reset condition from any operation mode
Any interrupt from Sleep mode or Idle mode
Port A wake-up from Sleep mode or Idle mode
How to change the Operation Mode
Normal mode to Green mode:
ClearMODE1to0,thenoperationmodeischangedto
Green mode but the UPEN status is not changed.
However, UPEN can be cleared by software.
Normal mode or Green mode to Sleep mode:
Step 1: Clear MODE0 to 0
Step 2: Clear MODE1 to 0
Step 3: Clear UPEN to 0
Step 4: Execute HALT instruction
After Step 4, operation mode is changed to Sleep
mode.
Normal mode or Green mode to Idle mode:
Step 1: Set MODE0 to 1
Step 2: Clear MODE1 to 0
Step 3: Clear UPEN to 0
Step 4: Execute HALT instruction
AfterStep4,operationmodeischangedtoIdlemode.
Green mode to Normal mode:
Step 1: Set UPEN to 1
Step 2: Software delay 20ms
Step 3: Set MODE1 to 1
After Step 3, operation mode is changed to Normal
mode.
Register
Label
Bits
R/W
Function
WDTS
(09H)
WS0
WS1
WS2
0
1
2
RW
Watchdog Timer division ratio selection bits
Bit 2, 1, 0=000, Division ratio=1:1
Bit 2, 1, 0=001, Division ratio=1:2
Bit 2, 1, 0=010, Division ratio=1:4
Bit 2, 1, 0=011, Division ratio=1:8
Bit 2, 1, 0=100, Division ratio=1:16
Bit 2, 1, 0=101, Division ratio=1:32
Bit 2, 1, 0=110, Division ratio=1:64
Bit 2, 1, 0=111, Division ratio=1:128
7~3
RW
Unused bit. These bits are read/write-able.
"
/
0 1 2
; A
"
.
"
/
) A
"
+
"
.
"
.
$ 5 .
(
0
/
.
"
' ( ) * + , -
Watchdog Timer
相關PDF資料 |
PDF描述 |
|---|---|
| HT95L00P | LCD Type Phone 8-Bit MCU |
| HT95L10P | 8-Bit LCD Type Phone Controller MCU |
| HT95L200 | 8-Bit LCD Type Phone Controller MCU |
| HT95L20P | 8-Bit LCD Type Phone Controller MCU |
| HT95L30P | 8-Bit LCD Type Phone Controller MCU |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HT95L000-56SSOP-A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type Phone 8-Bit MCU |
| HT95L00P | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type Phone 8-Bit MCU |
| HT95L00P-56SSOP-A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type Phone 8-Bit MCU |
| HT95L100 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:CID Type Phone 8-Bit MCU |
| HT95L100-64QEP-A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type Phone 8-Bit MCU |
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