Toshiba TLCS-900/H1 Series Manual page 385

Original cmos 32-bit microcontroller

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Note 1: <SCMM2:0> is automatically cleared to "000" after the specified command is issued. Before writing the next

command, make sure that <SCMM2:0> is "000". In the case of the Self Refresh Entry command, however,

<SCMM2:0> is not cleared to "000" by execution of this command. Thus, this register can be used as a flag

for checking whether or not Self Refresh is being performed.

Note 2: The Self Refresh Exit command can only be specified while Self Refresh is being performed.

SDRAM Command Register

Figure 3.16.1 SDRAM Control Registers

Command issue

(Note 1) (Note 2)

000: Not execute

001: Initialization sequence

a. Precharge All command

b. Eight Auto Refresh commands

c. Mode Register Set command

100: Mode Register Set command

101: Self Refresh Entry command

110: Self Refresh Exit command

Others: Reserved

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