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參數資料
| 型號： | HT95L20P-100QEP-A |
| 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： | 11/52頁 |
| 文件大小： | 364K |
| 代理商： | HT95L20P-100QEP-A |
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HT95LXXX
Rev. 1.20
11
May 26, 2004
Special Register, Embedded Control Register, LCD Display Memory and General Purpose RAM
(RABP
Function
Description
Supported for HT95LXXX
400/P 300/P 200/P 100/P 000/P
Special Function Register
00H
00H
IAR0
Indirect addressing register 0
00H
01H
MP0
Memory pointer register 0
00H
02H
IAR1
Indirect addressing register 1
00H
03H
MP1
Memory pointer register 1
00H
04H
BP
Bank Pointer register
00H
05H
ACC
Accumulator
00H
06H
PCL
Program counter lower-order byte register
00H
07H
TBLP
Table pointer
00H
08H
TBLH
Table higher-order byte register
00H
09H
WDTS
Watchdog Timer option setting register
00H
0AH
STATUS
Status register
00H
0BH
INTC0
Interrupt control register 0
00H
0CH
TMR0H
Timer/Event Counter 0 high-order byte
register
Stack Register
This is a special part of the memory which is used to
save the contents of the program counter only. The
stack is organized into 12 levels (HT95L400/40P), 8 lev-
els (HT95L300/30P, HT95L200/20P, HT95L100/10P) or
4 levels (HT95L000/00P) and is neither part of the data
nor part of the program space, and is neither readable
nor writable. The activated level is indexed by the stack
pointer (SP) and is neither readable nor writable. At a
subroutine call or interrupt acknowledge signal, the con-
tents of the program counter are pushed onto the stack.
At the end of a subroutine or an interrupt routine, sig-
naled by a return instruction (RETor RETI), the program
counter is restored to its previous value from the stack.
Afterachipreset,theSPwillpointtothetopofthestack.
If the stack is full and an interrupt takes place, the inter-
rupt request flag will be recorded but the acknowledge
signal will be inhibited even if this interrupt is enabled.
When the stack pointer is decremented (by RET or
RETI), the interrupt will be serviced. This feature pre-
ventsstackoverflowallowingtheprogrammertousethe
structure more easily. If the stack is full and a CALL is
subsequently executed, stack overflow occurs and the
first entry will be lost (only the most recent 12, 8 or 4, de-
pending on various MCU type, returned addresses are
stored).
Data Memory
The data memory is divided into four functional groups:
special function registers, embedded control register,
LCD display memory and general purpose memory.
Most are read/write, but some are read only.
The special function registers are located from 00H to
1FH. The embedded control registers are located in the
memory areas from 20H to 3FH. The remaining spaces
which are not specified in the following table before the
40H are reserved for future expanded usage and read-
ing these locations will get 00H . The general purpose
data memory is divided into 15 banks (HT95L400/40P),
11 banks (HT95L300/30P), 6 banks (HT95L200/20P,
HT95L100/10P) or 2 banks (HT95L000/00P). The
banks in the RAM are all addressed from 40H to 0FFH
and they are selected by setting the value of the bank
pointer (BP).
All of the data memory areas can handle arithmetic,
logic, increment, decrement and rotate operations di-
rectly. Except for some dedicated bits, each bit in the
data memory can be set and reset by SET [m].i and
CLR [m].i . They are also indirectly accessible through
memory pointer registers (MP0 or MP1). The
bank1~bank14 and bank27 are only indirectly accessi-
ble through memory pointer 1 register (MP1).
The LCD display memory is located at bank 1BH. They
can be read and written to by the indirect addressing
mode using memory pointer 1 (MP1). To turn the display
On or Off, a 1 or 0 is written to the corresponding bit
of the memory area.
相關PDF資料 |
PDF描述 |
|---|---|
| HT95A40P | LCD Type Phone 8-Bit MCU |
| HT95C400 | LCD Type Phone 8-Bit MCU |
| HT95C40P | LCD Type Phone 8-Bit MCU |
| HT95L000-56SSOP-A | LCD Type Phone 8-Bit MCU |
| HT95L00P-56SSOP-A | LCD Type Phone 8-Bit MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT95L300 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:CID Type Phone 8-Bit MCU |
| HT95L300-100QEP-A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type Phone 8-Bit MCU |
| HT95L30P | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:CID Type Phone 8-Bit MCU |
| HT95L30P-100QEP-A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type Phone 8-Bit MCU |
| HT95L400 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:CID Type Phone 8-Bit MCU |
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