FDC37C935-QS Standard Microsystems (SMSC), FDC37C935-QS Datasheet - Page 155

• Manufacturer Part Number: FDC37C935-QS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C935-QS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

RTC Mode Register
Default = 0x00
Serial EEPROM
Mode Register
Default = 0x00
Serial EEPROM
Pointer
Default = 0x00, on
POR, Reset_Drv or
Software Reset.
Write EEPROM
Data
NAME
Table 73 - RTC, Logical Device 6 [Logical Device Number = 0x06]
REG INDEX
0xF0 R/W
0xF1 R/W
0xF2 R/W
0xF3 W
Bit[0] = 1 : Lock CMOS RAM 80-9Fh
Bit[1] = 1 : Lock CMOS RAM A0-BFh
Bit[2] = 1 : Lock CMOS RAM C0-DFh
Bit[3] = 1 : Lock CMOS RAM E0-FFh
Bits[6:4] Reserved, set to zero
Bit[7]
= 0 Select lower 128-byte bank of RAM (includes
= 1 Select Upper 128-byte bank of RAM
Note: Once set, bits[3:0] can not be cleared by a
write; bits[3:0] are cleared only on Power On Reset
or upon a Hard Reset.
Bit[0] = 1 : Lock EEPROM 00-1Fh
Bit[1] = 1 : Lock EEPROM 20-3Fh
Bit[2] = 1 : Lock EEPROM 40-5Fh
Bit[3] = 1 : Lock EEPROM 60-7Fh
Bit[4] EEPROM Type
= 0 256 bit,1K-bit (93C06,93C46)
= 1 2K-bit,4K-bit (93C56,93C66)
Bits[7:5] Reserved, set to zero
Note: Once set, bits[3:0] can not be cleared by a
write; bits[3:0] are cleared only on Power On Reset
or upon a Hard Reset.
Use this register to set the Serial EEPROM's pointer.
EEPROM pointer address. The Serial Device Pointer
increments after each pair of reads from the
Resource Data register or after each pair of writes to
the Program Resource Data register.
This register is used to program the serial device
from the host.
EEPROMS in x16 configurations. Two bytes must
be written to this register in order to generate a
EEPROM write cycle. The LSB leads the MSB. The
first write to this register resets bit 0 of the Write
Status register. The second write resets bit 1 of the
Write Status register and generates a write cycle to
the serial EEPROM. The Write Status register must
be polled before performing a pair of writes to this
register.
The value in this register always reflects the current
RTC RAM).
155
DEFINITION
This device supports serial
STATE
C
C
C
C