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M34280M1-254FP Datasheet(PDF) 8 Page - Mitsubishi Electric Semiconductor

Part # M34280M1-254FP
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
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Manufacturer  MITSUBISHI [Mitsubishi Electric Semiconductor]
Direct Link  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M34280M1-254FP Datasheet(HTML) 8 Page - Mitsubishi Electric Semiconductor

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MITSUBISHI
ELECTRIC
8
MITSUBISHI MICROCOMPUTERS
4280 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
Fig. 7 Program counter (PC) structure
Fig. 8 Data pointer (DP) structure
Fig. 9 SD instruction execution example
p3 p2 p1 p0
a6 a5 a4 a3 a2 a1 a0
Program counter (PC)
PCH
Specifying
page
PCL
Specifying address
X1 X0 Y3 Y2 Y1 Y0
Data pointer (DP)
Register X (2)
Register Y (4)
Specifying
RAM digit
Specifying RAM file
(8) Program counter (PC)
Program counter (PC) is used to specify a ROM address (page
and address). It determines a sequence in which instructions
stored in ROM are read. It is a binary counter that increments
the number of instruction bytes each time an instruction is
executed. However, the value changes to a specified address
when branch instructions, subroutine call instructions, return
instructions, or the table reference instruction (TABP p) is
executed.
Program counter consists of PCH (most significant bit to bit 7)
which specifies to a ROM page and PCL (bits 6 to 0) which
specifies an address within a page. After it reaches the last
address (address 127) of a page, it specifies address 0 of the
next page (Figure 7).
Make sure that the PCH does not exceed after the last page of
the built-in ROM.
(9) Data pointer (DP)
Data pointer (DP) is used to specify a RAM address and
consists of registers X and Y. Register X specifies a file and
register Y specifies a RAM digit (Figure 8).
Register Y is also used to specify the port D bit position.
When using port D, set the port D bit position to register Y
certainly and execute the SD, RD, or SZD instruction (Figure
9).
0
1
01
D5
D7
D0
1
Specifying bit position
Set
Register Y (4)
Port D output latch


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