SH7615 Datasheet, PDF (157/925 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH
RISC engine Family/SH7600 Series

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SH7615 frequency change
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FMR .equ h'fffffe90
WTCSR .equ h'fffffe80
RSTCSR .equ h'fffffe83
PACR .equ h'fffffc80
XRAM .equ h'1000e000
.export _init_FMR
_init_FMR:
mov.l #XRAM,r1
mov.l r1,r5
mov.l #FREQUENCY,r2
mov.l #FREQUENCY_END,r3
program_move:
mov.w @r2,r0
mov.w r0,@r1
add #2,r1
add #2,r2
cmp/eq r2,r3
bf
program_move
nop
mov.l #PACR,r1
mov.w #h'0008,r0
mov.w r0,@r1
MOV.L #WTCSR,R1
MOV.W #H'A51F,R2
MOV.L #H'26200000,R3
MOV.L #FMR,R4
Rev. 2.00, 03/05, page 119 of 884