參數(shù)資料
型號(hào)： M34282E2
廠(chǎng)商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機(jī)的CMOS
文件頁(yè)數(shù)： 7/70頁(yè)
文件大?。?/td> 560K
代理商： M34282E2
MITSUBISHI
ELECTRIC
7
MITSUBISHI MICROCOMPUTERS
4282 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Fig. 5 Stack registers (SKs) structure
Fig. 6 Example of operation at subroutine call
(5) Most significant ROM code reference enable flag (URS)
URS flag controls whether to refer to the contents of the most
significant 1 bit (bit 8) of ROM code when executing the TABP
p instruction. If URS flag is
“
0,
”
the contents of the most
significant 1 bit of ROM code is not referred even when
executing the TABP p instruction. However, if URS flag is
“
1,
”
the contents of the most significant 1 bit of ROM code is set to
flag CY when executing the TABP p instruction (Figure 4).
URS flag is
“
0
”
after system is released from reset and returned
from RAM back-up mode. It can be set to
“
1
”
with the URSC
instruction, but cannot be cleared to
“
0.
”
(6) 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;
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 when executing a table reference
instruction. Accordingly, be careful not to over the stack. 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.
(7) Skip flag
Skip flag controls skip decision for the conditional skip
instructions and continuous described skip instructions.
Note : The 4282 Group just invalidates the next instruction
when a skip is performed. The contents of program
counter is not increased by 2. Accordingly, the number
of cycles does not change even if skip is not performed.
However, the cycle count becomes
“
1
”
if the TABP p,
RT, or RTS instruction is skipped.
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:
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