M37270MF Datasheet, PDF (9/95 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
FUNCTIONAL DESCRIPTION
Central Processing Unit (CPU)
The M37270MF-XXXSP uses the standard 740 family instruction set.
Refer to the table of 740 family addressing modes and machine in-
structions or the SERIES 740 <Software> User’s Manual for details
on the instruction set.
Machine-resident 740 family instructions are as follows:
The FST, SLW instruction cannot be used.
The MUL, DIV, WIT and STP instruction can be used.
CPU Mode Register
The CPU mode register contains the stack page selection bit and
internal system clock selection bit. The CPU mode register is allo-
cated at address 00FB16.
7
0
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CPU mode register
0 0 _{(CPUM (CM) : address 00FB16)}
Processor mode bits
b1 b0
0 0 : Single-chip mode
0 1:
1 0 : _{Not available}
1 1:
Stack page selection bit (Note)
0 : Zero page
1 : 1 page
Fix these bits to “1.”
XCOUT drivability selection bit
0 : Low drive
1 : High drive
Main colock (XIN–XOUT) stop bit
0 : Oscillating
1 : Stopped
Internal system clock selection bit
0 : XIN–XOUT selected (high-speed mode)
1 : XCIN–XCOUT selected (low-speed mode)
Note: Please beware of this bit when programming because it
is set to “1” after the reset release.
Fig. 1. Structure of CPU mode register
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