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参数资料
| 型号： | M34509G4HFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO24 |
| 封装： | 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24 |
| 文件页数： | 51/143页 |
| 文件大小： | 1056K |
| 代理商： | M34509G4HFP |
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4509 Group
Rev.1.03
2009.07.27
page 15 of 140
REJ03B0147-0103
(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 subrou-
tines can be nested up to 8 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 con-
tents 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 trans-
ferred 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 be-
fore 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 in-
struction.
(7) Skip flag
Skip flag controls skip decision for the conditional skip instructions
and continuous described skip instructions. When an interrupt oc-
curs, the contents of skip flag is stored automatically in the interrupt
stack register (SDP) and the skip condition is retained.
Fig. 5 Stack registers (SKs) structure
Fig. 6 Example of operation at subroutine call
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 RT
instruction
Executing BM
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.
Returning to the BM instruction execution
address with the RT instruction, and the BM
instruction becomes 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 :
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相关代理商/技术参数 |
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| M34509G4H-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M34509G4-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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| M34512M2-XXXFP | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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