FDC37B78X SMSC Corporation, FDC37B78X Datasheet - Page 193

• Manufacturer Part Number: FDC37B78X
• Description: Enhanced Super I/O Controller with ACPI Support/ Real Time Clock and Consumer IR
• Manufacturer: SMSC Corporation

RTC, Logical Device 6
Note 1: The secondary base address must be set to a value other than 70h prior to selecting this
option.
RTC Mode Register
Default = 0x00
on Vcc POR or
Reset_Drv
NAME
TABLE 81 - RTC, LOGICAL DEVICE 6 [LOGICAL DEVICE NUMBER = 0X06]
REG INDEX
0xF0 R/W
Bit[0] = 1 : Lock CMOS RAM 00-1Fh in Bank 1
Bit[1] = 1 : Lock CMOS RAM 20-3Fh in Bank 1
Bit[2] = 1 : Lock CMOS RAM 40-5Fh in Bank 1
Bit[3] = 1 : Lock CMOS RAM 60-7Fh in Bank 1
Bits[5:4] RTC Bank Selection
=00 Bank 1 at Secondary Base Address, Bank 0
Off (Default)
=01 Bank 0 at 70h and Bank 1 at Secondary Base
Address
=10 No Bank Selected
=11 Bank 0 at 70h, Bank 1 Off
Bit[7:6] Reserved
Note: Once set, bits[3:0] can not be cleared by a
write; bits[3:0] are cleared only on Vcc Power On
Reset or upon a Hard Reset.
(Note 1)
193
DEFINITION
STATE
C