Toshiba H1 Series - Manual (Page 235)

TMP92CZ26A
92CZ26A-232
(b) Self Refresh
The Self Refresh Entry command is issued by setting SDCMM to “101”.
Figure3.10.7 shows the Self Refresh cycle timing. Once Self Refresh is started, the SDRAM
is refreshed internally without the need to issue the Auto Refresh command.
Note 1: When standby mode is released by a system reset, the I/O registers are initialized and the Self Refresh state is
exited. Note that the Auto Refresh function is also disabled at this time.
Note 2: The SDRAM cannot be accessed while it is in the Self Refresh state.
Note 3: To execute the HALT instruction after the Self Refresh Entry command, insert at least 10 bytes of NOP or other
instructions between the instruction to set SDCMM to “101” and the HALT instruction.
Figure3.10.7 Self Refresh Cycle Timing
SDCLK
SDCKE
SDLUDQM
SDLLDQM
Self Refresh Entry Auto Refresh Mode
Set
Self Refresh Exit
SDCS
SDRAS
SDCAS
SDWE