Format Of Eeprom Write Control Register 10 - NEC PD789860 User Manual

Symbol 7 6
EEWC10 0 EWCS102 EWCS101 EWCS100
EWCS102 EWCS101 EWCS100
0 1
0 1
1 0
1 1
Other than above
ERE10 EWE10
0 0
0 1
1 0
1 1
EWST10
0 Not writing to EEPROM (EEPROM can be read or written. However, writing is disabled if EWE10 = 0.)
1 Writing to EEPROM (EEPROM cannot be read or written.)
Notes 1. Bit 1 is read only.
2. Even if timer 40 output is disabled (TOE40 = 0), the timer output signal is internally supplied to
EEPROM.
Caution Be sure to clear bit 3 to 1 and bit 7 to 0.
Remarks 1. f : System clock oscillation frequency (ceramic/crystal oscillation)
X
2. f : System clock oscillation frequency (RC oscillation)
CC
CHAPTER 5 EEPROM (DATA MEMORY)
Figure 5-2. Format of EEPROM Write Control Register 10
5 4 3
1
5 5
0 f /2 or f /2
X CC
6
1 f /2
X
7
0 f /2
X
0 Output of 8-bit timer 40
Setting prohibited
Write Read
Disabled Disabled EEPROM is in standby state (low power consumption mode)
Setting prohibited
Disabled Enabled
Enabled Enabled
User's Manual U14826EJ5V0UD
<2> <1> <0>
ERE10 EWST10 EWE10
EEPROM timer count clock selection
(Setting enabled only when f
(Setting enabled only when 1.41 ≤ f
(Setting enabled only when f
Note 2
(Setting enabled only when 8-bit timer 40 is
operating in discrete mode)
Remarks
EEPROM write status flag
Address After reset R/W
Note
FFD8H 08H R/W
< 1.41 MHz)
or f
CC X
≤ 2.81 MHz)
X
> 2.81 MHz)
X
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