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HT86070 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc

Part # HT86070
Description  Voice Synthesizer 8-Bit MCU
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT86070 Datasheet(HTML) 8 Page - Holtek Semiconductor Inc

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HT86030/HT86070
Rev. 1.00
8
February 20, 2006
Functional Description
Execution Flow
The system clock for the HT86030/HT86070 series is
derived from either a crystal or an RC oscillator. It is in-
ternally divided into four non-overlapping clocks. One
instruction cycle consists of four system clock cycles.
Instruction fetching and execution are pipelined in such
a way that a fetch takes one instruction cycle while de-
coding and execution takes the next instruction cycle.
However, the pipelining scheme causes each instruc-
tion to effectively execute within one cycle. If an instruc-
tion changes the program counter, two cycles are
required to complete the instruction.
Program Counter
- PC
The 13-bit program counter (PC) controls the sequence
in which the instructions stored in program ROM are ex-
ecuted.
After accessing a program memory word to fetch an in-
struction code, the contents of the program counter are
incremented by one. The program counter then points
to the memory word containing the next instruction
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 PC manipulates the program transfer by
loading the address corresponding to each instruction.
Mode
Program Counter
*12
*11
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial Reset
0000000000000
External or Serial Input Interrupt
0000000000100
Timer/Event Counter 0 Overflow
0000000001000
Timer/Event Counter 1 Overflow
0000000001100
Timer Counter 3 Overflow
0000000010100
Skip
Program Counter+2
Loading PCL
*12
*11
*10
*9
*8
@7
@6
@5
@4
@3
@2
@1
@0
Jump, Call Branch
#12
#11
#10
#9
#8
#7
#6
#5
#4
#3
#2
#1
#0
Program Counter
Note: *12~*0: Program counter bits
S12~S0: Stack register bits
#12~#0: Instruction code bits
@7~@0: PCL bits
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
T 1
T 2
T 3
T 4
F e t c h I N S T ( P C )
E x e c u t e I N S T ( P C - 1 )
F e t c h I N S T ( P C + 1 )
E x e c u t e I N S T ( P C )
F e t c h I N S T ( P C + 2 )
E x e c u t e I N S T ( P C + 1 )
P C
P C + 1
P C + 2
S y s t e m C l o c k
O S C ( R C o n l y )
P C
P 1
P 2
P 3
P 4
I n t e r n a l
P h a s e
C l o c k s
Execution Flow


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