參數(shù)資料
型號： M34551E8-XXXFP
元件分類： 微控制器/微處理器
英文描述： 4-BIT, OTPROM, MICROCONTROLLER, PQFP48
封裝： 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù)： 70/154頁
文件大小： 1778K
代理商： M34551E8-XXXFP
FUNCTIONAL BLOCK OPERATIONS
4551 Group User’s Manual
HARDWARE
1-11
Fig. 5 Stack registers (SKs) structure
Fig. 6 Example of operation at subroutine call
(5) Stack registers (SKS) 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 eight identical registers, so that
subroutines can be nested up to 8 levels. However, one of
stack registers is used when using an interrupt service routine
or when executing a table reference instruction. Accordingly,
be careful not to stack over when performing these operations
together. The contents of registers SKs are destroyed when
8 levels are exceeded.
The register SK nesting level is pointed automatically by 3-
bit stack pointer (SP). The contents of the stack pointer (SP)
can be transferred to register A with the TASP instruction.
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, skip flag, register
A, and register B just before an interrupt until returning to the
original routine. Multiple interrupts cannot be used.
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.
Returning to the BM instruction execution
address with the RT instruction, and the BM
instruction is equivalent to the NOP instruction.
(SP)
0
(SK0)
000116
(PC)
SUB1
Main program
000216 NOP
Address
000016 NOP
000116 BM SUB1
Subroutine
SUB1 :
NOP
RT
(PC)
(SK0)
(SP)
7
Note:
SK0
SK1
SK2
SK3
SK4
SK5
SK6
SK7
(SP) = 0
(SP) = 1
(SP) = 2
(SP) = 3
(SP) = 4
(SP) = 5
(SP) = 6
(SP) = 7
Program counter (PC)
Executing the return or
table reference instruction
Executing the subroutine
call or table reference
instruction
Stack pointer (SP) points “7” 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 SK0.
When the BM instruction is executed after eight
stack registers are used ((SP) = 7), (SP) = 0
and the contents of SK0 is destroyed.
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