參數(shù)資料
型號： M34250
廠商： Mitsubishi Electric Corporation
英文描述： Single Chip 4 Bits CMOS Microcomputer(4位單片機(jī))
中文描述： 4位單片微機(jī)的CMOS（4位單片機(jī)）
文件頁數(shù)： 12/58頁
文件大?。?/td> 331K
代理商： M34250
MITSUBISHI
ELECTRIC
12
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
Fig. 5 Stack registers (SKs) structure
Fig. 6 Example of operation at subroutine call
SK
0
SK
1
SK
2
SK
3
(SP) = 0
(SP) = 1
(SP) = 2
(SP) = 3
Program counter (PC)
Executing RT
instruction
Executing BM
instruction
Stack pointer (SP) points “3” at reset or
returning from RAM back-up mode. It points “0”
by executing the first BM instruction, and the
contents of program counter is stored in SK
0
.
When the BM instruction is executed after four
stack registers are used ((SP) = 3), (SP) = 0
and the contents of SK
0
is destroyed.
Returning to the BM instruction execution
address with the RT instruction, and the BM
instruction is equivalent to the NOP instruction.
(SP)
(SK
0
)
(PC)
0
0001
16
SUB1
Main program
0002
16
NOP
Address
0000
16
NOP
0001
16
BM SUB1
Subroutine
SUB1 :
NOP
·
·
RT
(PC)
(SP)
(SK
0
)
3
·
Note:
(5) Stack registers (SK
s
) and stack pointer (SP)
Stack registers (SKs) are used to temporarily store the contents
of program counter (PC) just before branching until returning
to the original routine when;
branching to an interrupt service routine (referred to as an
interrupt service routine),
performing a subroutine call, or
executing the table reference instruction (TABP p).
Stack registers (SKs) are four identical registers, so that
subroutines can be nested up to 4 levels. However, one of
stack registers is used respectively when using an interrupt
service routine and when executing a table reference
instruction. Accordingly, be careful not to over the stack when
performing these operations together. The contents of registers
SKs are destroyed when 4 levels are exceeded.
The register SK nesting level is pointed automatically by 2-bit
stack pointer (SP).
Figure 5 shows the stack registers (SKs) structure.
Figure 6 shows the example of operation at subroutine call.
(6) Interrupt stack register (SDP)
Interrupt stack register (SDP) is a 1-stage register. When an
interrupt occurs, this register (SDP) is used to temporarily store
the contents of data pointer, carry flag and skip flag just before
an interrupt until returning to the original routine.
Unlike the stack registers (SKs), this register (SDP) is not used
when executing the subroutine call instruction and the table
reference instruction.
(7) Skip flag
Skip flag controls skip decision for the conditional skip
instructions and continuous described skip instructions. When
an interrupt occurs, the contents of skip flag is stored
automatically in the interrupt stack register (SDP) and the skip
condition is retained.
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