Eeprom Write Control Register (Ewc); Format Of Eeprom Write Control Register - NEC PD754144 User Manual

5.3 EEPROM Write Control Register (EWC)

The EEPROM write control register (EWC) is an 8-bit register used to control manipulation of EEPROM. Figure
5-1 shows its configuration.
Address
FCEH
CHAPTER 5 EEPROM
Figure 5-1. Format of EEPROM Write Control Register
7 6 5 4
ERE EWTC6 EWTC5 EWTC4
EEPROM read enable flag
ERE
0 EEPROM read disabled (suppresses current)
EEPROM read enabled (after 15 µ s)
1
Dedicated EEPROM write timer clock selection bit
EWTC6 EWTC5 EWTC4
0 0
0 0
0 1
0 1
1 0
1 0
Other than above
f = system clock oscillation frequency
X
EEPROM write enable/disable control bit
EWE
0 Disable
1 Enable
EEPROM write status flag
EWST
0 EEPROM write enable
1 EEPROM being written (EEPROM writing is not possible. If writing
is attempted, it is ignored.)
User's Manual U10676EJ3V0UM
3 2 1 0
EWE EWST – –
EEPROM
Selection of count clock
18 × 2
13
0 /f
X
18 × 2
12
1 /f
X
18 × 2
11
0 /f
X
18 × 2
10
1 /f
X
18 × 2
9
0 /f
X
18 × 2
8
1 /f
X
Setting prohibited
EEPROM write operation
Write status
Symbol
EWC
81