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参数资料
| 型号： | HT86384(68PLCC) |
| 英文描述： | Microcontroller |
| 中文描述： | 微控制器 |
| 文件页数： | 11/28页 |
| 文件大小： | 195K |
| 代理商： | HT86384(68PLCC) |
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HT86XXX
Rev. 1.00
11
November 1, 2002
Functional Description
Execution flow
The system clock for the HT86XXX series is derived
from either a crystal or an RC oscillator. It is internally di-
vided 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
Mode
Program Counter
*12
*11
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
External or Serial Input Interrupt
0
0
0
0
0
0
0
0
0
0
1
0
0
Timer/EventCounter0Overflow
0
0
0
0
0
0
0
0
0
1
0
0
0
Timer/EventCounter1Overflow
0
0
0
0
0
0
0
0
0
1
1
0
0
Timer Counter 2 Overflow
0
0
0
0
0
0
0
0
1
0
0
0
0
Timer Counter 3 Overflow
0
0
0
0
0
0
0
0
1
0
1
0
0
Skip
PC+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
Return from Subroutine
S12
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Program counter
Note: *12~*0: Program counter bits
S12~S0: Stack register bits
#12~#0: Instruction code bits
@7~@0: PCL bits
0
*
0
*
0
*
<
$ '
' 8
9
=
'
' 8
5 9
<
$ '
' 8
>
9
=
'
' 8
9
<
$ '
' 8
>
9
=
'
' 8
>
9
>
>
"
'
-
' 8
'
- " 9
0
*
-
$
-
Execution flow
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