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參數資料
| 型號： | HT95C400 |
| 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： | 8/52頁 |
| 文件大小： | 364K |
| 代理商： | HT95C400 |
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Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
DTMF Generator
V
TDC
DTMF Output DC Level
0.45V
DD
0.7V
DD
V
V
TOL
DTMF Sink Current
V
DTMF
=0.5V
0.1
mA
V
TAC
DTMF Output AC Level
Row group, R
L
=5k
120
155
180
mVrms
R
L
DTMF Output Load
THD
23dB
5
k
A
CR
Column Pre-emphasis
Row group=0dB
1
2
3
dB
THD
Tone Signal Distortion
R
L
=5k
30
23
dB
HT95LXXX
Rev. 1.20
8
May 26, 2004
Functional Description
Execution Flow
The system clock for the telephone controller is derived
from a 32768Hzcrystal oscillator. Abuilt-infrequencyup
conversion circuit provides dual system clock, namely;
32768Hz and 3.58MHz. The system clock is internally
divided into four non-overlapping clocks. One instruc-
tion cycle consists of four system clock cycles. Instruc-
tion fetching and execution are pipelined in such a way
that a fetch takes an instruction cycle while decoding
and execution takes the next instruction cycle. The
pipelining scheme causes each instruction to be effec-
tively executed in a instruction cycle. If an instruction
changes the program counter, two instruction cycles are
required to complete the instruction.
Program Counter
PC
The program counter (PC) controls the sequence in
which the instructions stored in the program ROM are
executed and its contents specify a full range of pro-
gram memory. After accessing a program memory word
to fetch an instruction code, the contents of the program
counter are incremented by 1. The program counter
then points to the memory word containing the next in-
struction code.
When executing a jump instruction, conditional skip ex-
ecution, loading PCL register, subroutine call, initial re-
set, internal interrupt, external interrupt or return from
subroutine, the program counter manipulates the pro-
gram transfer by loading the address corresponding to
each instruction. The conditional skip is activated by
instructions. Once the condition is met, the next instruc-
tion, fetched during the current instruction execution, is
discarded and a dummy cycle replaces it to get the
proper instruction. Otherwise proceed to the next in-
struction.
The program counter lower order byte register
(PCL:06H) is a readable and write-able register. Moving
data into the PCL performs a short jump. The destina-
tion will be within 256 locations. When a control transfer
takes place, an additional dummy cycle is required.
Program Memory
ROM
The program memory is used to store the program in-
structions which are to be executed. It also contains
data, table, and interrupt entries, and is organized into
8K 16 bits 2 banks (HT95L400/40P), 8K 16 bits
(HT95L300/30P, HT95L200/20P) or 4K 16 bits
(HT95L100/10P, HT95L000/00P), addressed by the
program counter and table pointer.
For the HT95L400/40P, the program memory is divided
into 2 banks, each bank having a ROM Size 8K 16 bits.
To move from the present ROM bank to a different ROM
bank, the higher 1 bits of the ROM address are set by
the BP (Bank Pointer), while the remaining 13 bits of the
PCaresetintheusualwaybyexecutingtheappropriate
jump or call instruction. As the 14 address bits are
latched during the execution of a call or jump instruction,
the correct value of the BP must first be setup before a
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Execution Flow
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| HT95L000 | LCD Type Phone 8-Bit MCU |
| HT95L00P | LCD Type Phone 8-Bit MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT95C40P | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:LCD Type Phone 8-Bit MCU |
| HT95CXXX | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:CID Type Phone 8-Bit MCU |
| HT95L000 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:CID Type Phone 8-Bit MCU |
| 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 |
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