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參數(shù)資料
| 型號： | HTG1390 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | 4-bit Microcontroller |
| 中文描述： | 4位微控制器 |
| 文件頁數(shù)： | 7/27頁 |
| 文件大?。?/td> | 427K |
| 代理商： | HTG1390 |
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Mode
Program Counter
PC11 PC10 PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
P11
P10
P9
P8
P7
P6
@
P10
P9
P8
P7
P6
S11
S10
S9
S8
S7
S6
Initial reset
Internal interrupt
E xternal interrupt
J ump, call instruction
Conditional branch
Return from subroutine
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
P5
P5
S5
P4
P4
S4
P3
P3
S3
P2
P2
S2
P1
P1
S1
P0
P0
S0
Program memory
System Architecture
Program counter – PC
This counter addresses the program ROM and
is arranged as an 12-bit binary counter from
PC0 to PC11 whose contents specify a maxi-
mum of 4096 addresses. The program counter
counts with an increment of 1 or 2 with each
execution of an instruction.
When executing the jump instruction (J MP,
J NZ, J C, J TMR,...), a subroutine call, initial
reset, internal interrupt, external interrupt or
returning from a subroutine, the program
counter is loaded with the corresponding in-
struction data as shown in the table.
Notes: P0~P11: Instruction code
@: PC11 keeps current value
S0~S11: Stack register bits
Program memory – ROM
The program memory is the executable memory
and is arranged in a 4096
×
8 bit format. The
address is specified by the program counter
(PC). Four special locations are reserved as de-
scribed as follows.
Location 0
Activating the processor RE S pin causes the
first instruction to be fetched from location 0.
Location 4
Contains the timer interrupt resulting from a
TIMER overflow. If the interrupts are enabled it
causes the program to jump to this subroutine.
Location 8
Activating the PS or PP input pins of the
processor with the interrupts enabled during
Halt mode causes the program to jump to this
location.
Locations n00H to nFFH
These are the 256 bytes of each page in pro-
gram memory. This area from n00H to nFFH
and F00H to FFFH can be used as a look–up
table. Instructions such as READ R4A, READ
MR0A, RE ADF R4A, RE ADF MR0A can read
the table and transfer the contents of the
table to ACC and R4 or to ACC and a data
memory address specified by the register pair
R1,R0. However as R1,R0 can only store 8
bits, these instructions cannot fully specify
the full 12 bit program memory address. For
this reason a jump instruction should be first
used to place the program counter in the right
page. The above instructions can then be used
to read the look up table data.
Program memory
HTG1390
Preliminary
7
17th Nov ’98
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