Toshiba TLCS-900/H1 Series Manual page 389

Original cmos 32-bit microcontroller

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(b) Self-refresh

The self-refresh ENTRY command is generated by setting SDCMM<SCMM2:0>

to "101". The self-refresh cycle is shown in Figure 3.16.5. During self-refresh Entry,

refresh is performed within the SDRAM (an auto-refresh command is not needed).

The auto-refresh command is automatically executed once when self-refresh is

released, following which, refresh is executed according to the setting of 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<SCMM2:0> to "101" and the HALT instruction.

Self-refresh

Timing of Self-Refresh Cycle

Figure 3.16.5

Self-refresh

Auto-refresh

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