s3c72m9 Samsung Semiconductor, Inc., s3c72m9 Datasheet - Page 95

• Manufacturer Part Number: s3c72m9
• Description: The S3c72m5/s3c72m7/s3c72m9 Single-chip Cmos Microcontroller Has Been Designed For High Performance Using Samsung S
• Manufacturer: Samsung Semiconductor, Inc.

S3C72M5/C72M7/C72M9/P72M9 (Preliminary Spec)
SCMOD
Bit
Identifier
RESET Value
Read/Write
Bit Addressing
SCMOD.3
SCMOD.2
SCMOD.1
SCMOD.0
NOTES:
1.
2.
3.
SCMOD bits 3 and 0 cannot be modified simultaneously by a 4-bit instruction; they can only be modified by
separate 1-bit instructions.
Sub-oscillation goes into stop mode only by SCMOD.2. PCON which revokes stop mode cannot stop the sub-
oscillation. The stop of sub-oscillation is released only by reset regardless of the value of SCMOD.2 .
You can use SCMOD.2 as follows (ex; after data bank was used, a few minutes have passed):
Main operation
operation
— System Clock Mode Control Register
main operation
sub-operation
Bit 3
Bit 2
Bit 1
Bit 0
0
1
0
1
0
0
1
W
.3
3
0
1
Enable main system clock
Disable main system clock
Enable sub system clock
Disable sub system clock
Always logic zero
Select main system clock
Select sub system clock
SCMOD.2 = 1
sub-idle (LCD on, after a few minutes later without any external input)
"0"
W
2
0
1
main stop mode (LCD off).
"0"
W
1
0
1
W
.0
0
0
1
CPU
MEMORY MAP
sub-
FB7H
4-41