參數(shù)資料
型號: 48e30
廠商: Holtek Semiconductor Inc.
英文描述: 8-Bit I/O Type MCU (With EEPROM)
中文描述: 8位I / O型微控制器(帶EEPROM)
文件頁數(shù): 42/44頁
文件大?。?/td> 351K
代理商: 48E30
HT48E30
Rev. 0.00
7
January 12, 2004
Preliminary
Instruction
Table Location
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
TABRDC [m]
P10
P9
P8
@7
@6
@5
@4
@3
@2
@1
@0
TABRDL [m]
1
@7
@6
@5
@4
@3
@2
@1
@0
Table Location
Note: *10~*0: Table location bits
P10~P8: Current program counter bits
@7~@0: Table pointer bits
In System Programming
In system programming allows programming and repro-
gramming of HT48EXX microcontroller on application
circuit board, this will save time and money, both during
development in the lab. Using a simple 3-wire interface,
the ISP communicates serially with the HT48EXX
microcontroller, reprogramming program memory and
EEPROM data memory on the chip.
Pin Name Function
Description
PA0
SDATA
Serial data input/output
PA4
SCLK
Serial clock input
RES
RESET
Device reset
VDD
Power supply
VSS
Ground
ISP Pin Assignments
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
2048
14 bits, addressed by the program counter and ta-
ble pointer.
Certain locations in the program memory are reserved
for special usage:
Location 000H
This area is reserved for program initialization. After a
chip reset, the program always begins execution at lo-
cation 000H.
Location 004H
This area is reserved for the external interrupt service
program. If the INT input pin is activated, the interrupt
is enabled and the stack is not full, the program begins
execution at location 004H.
Location 008H
This area is reserved for the timer/event counter inter-
rupt service program. If a timer interrupt results from a
timer/event counter overflow, and if the interrupt is en-
abled and the stack is not full, the program begins exe-
cution at location 008H.
Table location
Any location in the program memory space can be
used as look-up tables. The instructions
TABRDC
[m]
(the current page, one page=256 words) and
TABRDL [m] (the last page) transfer the contents of
the lower-order byte to the specified data memory,
and the higher-order byte to TBLH (08H). Only the
destination of the lower-order byte in the table is
well-defined, the other bits of the table word are trans-
ferred to the lower portion of TBLH, and the remaining
2-bits words are read as
0. The Table Higher-order
byte register (TBLH) is read only. The table pointer
(TBLP) is a read/write register (07H), which indicates
the table location. Before accessing the table, the lo-
cation must be placed in the TBLP. The TBLH is read
only and cannot be restored. If the main routine and
the ISR (Interrupt Service Routine) both employ the
table read instruction, the contents of the TBLH in the
main routine are likely to be changed by the table read
instruction used in the ISR. Errors can occur. In other
words, using the table read instruction in the main rou-
tine and the ISR simultaneously should be avoided.
However, if the table read instruction has to be applied
in both the main routine and the ISR, the interrupt is
supposed to be disabled prior to the table read in-
struction. It will not be enabled until the TBLH has
been backed up. All table related instructions require
7 F F H
n F F H
P r o g r a m
M e m o r y
D e v i c e I n i t i a l i z a t i o n P r o g r a m
E x t e r n a l I n t e r r u p t S u b r o u t i n e
T i m e r / E v e n t C o u n t e r
I n t e r r u p t S u b r o u t i n e
L o o k - u p T a b l e ( 2 5 6 w o r d s )
N o t e : n r a n g e s f r o m 0 t o 7
n 0 0 H
0 0 8 H
0 0 4 H
0 0 0 H
1 4 b i t s
7 0 0 H
Program Memory
相關(guān)PDF資料
PDF描述
48L120D STANDARD RECOVERY DIODES
48L160D STANDARD RECOVERY DIODES
48LF120D CAP 1500PF 50V CERAMIC MONO 5%
48LF160D STANDARD RECOVERY DIODES
48LFR120D STANDARD RECOVERY DIODES
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
48-EM 制造商:ITW Switches 功能描述:ELECTROMECHANICAL SWITCH KIT, Kit Contents:Miniature Sealed Electro-Mechanical P
48ES 制造商:VISUAL COMMUNICATIONS COMPANY LLC 功能描述:48ES /Custom Part
48ESB 功能描述:燈 Telephone Slide Base .04A .358M ANSI#5 RoHS:否 制造商:Chicago Miniature 燈類型:Incandescent 燈座類型:Wire Terminal 燈大小:T-1 3/4 顏色: 電壓:14 V 工作電流: MSCP:0.3 MSCP 壽命:40000 hr 封裝:Bulk
48ESB- 功能描述:LAMP T-2 TELEPHONE SLIDE 48V RoHS:是 類別:光電元件 >> 燈 - 白熾燈,氖燈 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 顏色:透明 透鏡樣式/尺寸:圓形,帶圓頂,5mm,T-1 3/4 引線型:小型凹槽 MSCP(平均球面燭光):0.3 額定電壓:60V 其它名稱:913.4005913.4005-ND
48ESB 制造商:PRIVATE LABEL 功能描述:Incandescent Filament Lamp, Voltage Rating:48V, Bulb Size:T-2, Lamp Ba Type:Slide