7630 Datasheet, PDF (7/49 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
7630 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
FUNCTIONAL DESCRIPTION
Central Processing Unit (CPU)
The core of 7630 group microcomputers is the 7600 series CPU.
This core is based on the standard instruction set of 740 series;
however the performance is improved by allowing to execute the
same instructions as that of the 740 series in less cycles. Refer to
the 7600 Series Software Manual for details of the instruction set.
CPU Mode Register CPUM
The CPU mode register contains the stack page selection bit and
internal system clock selection bit. The CPU mode register is allo-
cated to address 0000₁₆.
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0
CPU mode register (address 0000₁₆)
CPUM
Processor mode bits (set these bits to “00”)
b1 b0
0 0: Single–chip mode
0 1: Not used
1 0: Not used
1 1: Not used
Stack page selection bit
0 : 0 page
1 : 1 page
Not used (“0” when read, do not write “1”)
Internal system clock selection bit
0 : φ=f(X_IN) divided by 2 (high–speed mode)
1 : φ=f(X_IN) divided by 8 (middle–speed mode)
Not used (“0” when read, do not write “1”)
Fig. 5 Structure of CPU mode register
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