Renesas SH7262 R5S72620 User Manual

 
Section 9   Bus State Controller 
 

Page 238 of 2108 

 

R01UH0134EJ0400  Rev. 4.00 

 

 Sep 

24, 

2014 

SH7262 Group, SH7264 Group

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.