HT46R652-100 데이터 시트보기 (PDF) - Holtek Semiconductor
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HT46R652-100 Datasheet PDF : 47 Pages
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HT46R652
The lower byte of the PC, known as PCL is a readable
and writeable register. Moving data into the PCL per-
forms a short jump. The destination is within 256 loca-
tions.
When a control transfer takes place, an additional
dummy cycle is required.
Program Memory
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
8192´16 bits which are addressed by the program
counter and table pointer.
Certain locations in the ROM are reserved for special
usage:
· Location 000H
Location 000H is reserved for program initialization.
After a device reset, the program always begins exe-
cution at this location.
· Location 004H
Location 004H is reserved for the external interrupt
service program. If the INT0 input pin is activated, and
the interrupt is enabled, and the stack is not full, the
program begins execution at location 004H.
000H
D e v ic e in itia liz a tio n p r o g r a m
004H
E x te r n a l in te r r u p t 0 s u b r o u tin e
008H
E x te r n a l in te r r u p t 1 s u b r o u tin e
00C H
T im e r /e v e n t c o u n te r 0 in te r r u p t s u b r o u tin e
010H
T im e r /e v e n t c o u n te r 1 in te r r u p t s u b r o u tin e
014H
T im e B a s e In te r r u p t
018H
R T C In te rru p t
n00H
L o o k - u p ta b le ( 2 5 6 w o r d s )
P ro g ra m
M e m o ry
nFFH
1FFFH
L o o k - u p ta b le ( 2 5 6 w o r d s )
1 6 b its
N o te : n ra n g e s fro m 0 to 1 F
Program Memory
· Location 008H
Location 008H is reserved for the external interrupt
service program also. If the INT1 input pin is activated,
and the interrupt is enabled, and the stack is not full,
the program begins execution at location 008H.
· Location 00CH
Location 00CH is reserved for the Timer/Event Coun-
ter 0 interrupt service program. If a timer interrupt re-
sults from a Timer/Event Counter 0 overflow, and if the
interrupt is enabled and the stack is not full, the pro-
gram begins execution at location 00CH.
· Location 010H
Location 010H is reserved for the Timer/Event Coun-
ter 1 interrupt service program. If a timer interrupt re-
sults from a Timer/Event Counter 1 overflow, and if the
interrupt is enabled and the stack is not full, the pro-
gram begins execution at location 010H.
· Location 014H
Location 014H is reserved for the Time Base interrupt
service program. If a Time Base interrupt occurs, and
the interrupt is enabled, and the stack is not full, the
program begins execution at location 014H.
· Location 018H
Location 018H is reserved for the real time clock inter-
rupt service program. If a real time clock interrupt oc-
curs, and the interrupt is enabled, and the stack is not
full, the program begins execution at location 018H.
· Table location
Any location in the Program Memory can be used as a
look-up table. The instructions ²TABRDC [m]² (the
current page, 1 page=256 words) and ²TABRDL [m]²
(the last page) transfer the contents of the lower-order
byte to the specified data memory, and the contents of
the higher-order byte to TBLH which is the Table
Higher-order byte register. Only the destination of the
lower-order byte in the table is well-defined; the other
bits of the table word are all transferred to the lower
portion of TBLH. The TBLH register is read only, and
the table pointer, TBLP, is a read/write register, indi-
cating the table location. Before accessing the table,
the location should be placed in TBLP. All the table re-
lated instructions require 2 cycles to complete the op-
eration. These areas may function as a normal
Program Memory depending upon the user¢s require-
ments.
Instruction(s)
TABRDC [m]
TABRDL [m]
*12 *11 *10 *9
P12 P11 P10 P9
1
11
1
Table Location
*8
*7
*6
*5
*4
*3 *2 *1 *0
P8 @7 @6 @5 @4 @3 @2 @1 @0
1 @7 @6 @5 @4 @3 @2 @1 @0
Note: *12~*0: Table location bits
@7~@0: Table pointer bits
Table Location
P12~P8: Current program counter bits
Rev. 1.00
9
December 19, 2006
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