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Section 9 Bus State Controller
Page 238 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Register Name Abbreviation R/W Initial Value Address
Access
Size
SDRAM control register SDCR R/W H'00000000 H'FFFC004C 32
Refresh timer
control/status register
RTCSR R/W H'00000000 H'FFFC0050 32
Refresh timer counter RTCNT R/W H'00000000 H'FFFC0054 32
Refresh time constant
register
RTCOR R/W H'00000000 H'FFFC0058 32
AC characteristics
switching register
ACSWR R/W*
1
H'00000000 H'FFFC180C 32
AC characteristics
switching key register
ACKEYR W*
2
H'FFFC1BFC 8
Notes: 1. A special sequence using the AC characteristics switching key register is necessary for
writing to this register.
2. Write-only register. The write value is arbitrary.