TMP92CF30
2009-06-12
92CF30-202
The Self Refresh state can be exited by the Self Refresh Exit command. The Self Refresh
Exit command is executed when SDCMM<SCMM2:0> is set to “110”. It is also executed
automatically in synchronization with HALT mode release. In either of these two cases,
Auto Refresh is performed immediately after the Self Refresh state is exited. Then, Auto
Refresh is executed at specified intervals. Exiting the Self Refresh state clears
SDCMM<SCMM2:0> to “000”.
SDRAM Refresh Control Register
7 6 5 4 3 2 1 0
Bit symbol
−
SSAE
SRS2
SRS1
SRS0
SRC
Read/Write R/W
R/W
Reset
State
0 1 0 0 0 0
Refresh interval
SDRCR
(0252H)
Function Always
write “0”
Self
Refresh
auto exit
function
0:Disable
1:Enable
000: 47 states
001: 78 states
010: 156 states
011: 312 states
100: 468 states
101: 624 states
110: 936 states
111: 1248 states
Auto
Refresh
0:Disable
1:Enable
Setting SDRCR<SSAE> to “1” enables automatic execution of the Self Refresh Exit
command in synchronization with HALT release.
Setting SDRCR<SSAE> to “0” disables automatic execution of the Self Refresh Exit
command in synchronization with HALT release. The auto exit function should also be
disabled in cases where the SDRAM operation requirements cannot be met as the operation
clock frequency is reduced by clock gear down, as shown in Figure 3.10.8.
Figure 3.10.8 Execution Flow for Executing HALT Instruction after Clock Gear Down
HALT mode
Gear down
SR
ENTRY
CLK
change
HALT
Interrupt
Auto Exit
disable
Self Refresh
Gear up
f
SYS
CPU
SDRAM controller
internal state
Auto-EXIT
disable
Auto-EXIT
enable
SR
EXIT
CLK
change
Auto Exit
enable
SDRAM state
Auto Refresh
Auto Exit
enable
Auto Refresh
60MHz
|
|
625 kHz (10MHz/16)
Содержание TLCS-900/H1 Series
Страница 1: ...TOSHIBA Original CMOS 32 Bit Microcontroller TLCS 900 H1 Series TMP92CF30FG Semiconductor Company ...
Страница 650: ...TMP92CF30 2009 06 12 92CF30 648 7 Package Dimensions LQFP176 P 2020 0 40F TOP VIEW BOTTOM VIEW Detail view of A 25 1 A ...
Страница 652: ...TMP92CF30 2009 06 12 92CF30 650 ...