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HTG13J0 Scheda tecnica(PDF) 8 Page - Holtek Semiconductor Inc

Il numero della parte HTG13J0
Spiegazioni elettronici  4-Bit Microcontroller
PDF  30 Pages
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Produttore elettronici  HOLTEK [Holtek Semiconductor Inc]
Homepage  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HTG13J0 Scheda tecnica(HTML) 8 Page - Holtek Semiconductor Inc

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HT13J0
8
May19,1999
Mode
ProgramCounter
PA3 PC11 PC10 PC9 PC8
PC7
PC6
PC5 PC4
PC3
PC2
PC1
PC0
Initial
reset
1
0
0
0
00
00
00
0
0
0
Internal
interrupt
PA3
0
0
0
0
0
0
0
0
0
1
0
0
External
interrupt
PA3
0
0
0
0
0
0
0
0
1
0
0
0
Jump,call
instruction
PA3 PC11 PC10 PC9 PC8
PC7
PC6
PC5 PC4
PC3
PC2
PC1
PC0
Conditional
branch
PA3
@
PC10 PC9 PC8
PC7
PC6
PC5 PC4
PC3
PC2
PC1
PC0
Returnfrom
subroutine
PA3
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Programcounter
Notes:PC11~PC0:Instructioncodebits
@:PC11keepsthecurrentvalue
S11~S0:Stackregisterbits
PA3:Bankvaluebits
FunctionalDescription
Programcounter
- PC
The bit 13 of program memory is controlled by
PA3 which can change the address of the pro-
gram. There are two banks of the program
memory, which are selected by PA3, every bank
is 4KB ROM. The instruction "UT PA,A" is used
to change the value of PA3. Then, low or high
4K ROM is selected accordingly. All instruc-
tions are not effective on crossing bank, unless
thevalueofPA3ischangedinadvance.
The 12-bit program counter (PC) controls the
sequence in which the instructions stored in
program ROM are executed and its contents
specifyamaximumof4096addresses.
After accessing a memory word to fetch an in-
struction code, the contents of the program
counter are incremented by 1 or 2, then the pro-
gram counter will point to the memory word
containingthenextinstructioncode.
When executing the jump instruction (JMP,
JNZ, JC,JTMR...), subroutine call, internal in-
terrupt, external interrupt or return from sub-
routine, the PC manipulates the program
transfer by loading the address corresponding
toeachinstruction.



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