參數(shù)資料
型號: μPD789187
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 24/146頁
文件大小: 630K
代理商: ΜPD789187
Preliminary Product Information
24
μ
PD789186, 789187, 789196, 789197
Figure 5-2. Format of EEPROM Write Control Register 0
0
EWCS02 EWCS01 EWCS00
ERST0
ERE0
EWST0
EWE0
EEWC0
Symbol
Address
When reset
R/W
FFCCH
04H
R/W
6
7
0
5
4
3
2
1
EWCS02 EWCS01 EWCS00
EEPROM timer count clock selection
fx/2
3
(625 kHz)
fx/2
4
(313 kHz)
fx/2
5
(156 kHz)
fx/2
6
(78.1 kHz)
fx/2
7
(39.1 kHz)
fx/2
8
(19.5 kHz)
8-bit timer (TM80) output
Not to be specified
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
ERE0
EWE0
Write
Read
Remarks
EEPROM is in the standby state (low power consumption mode).
0
1
×
0
1
Disabled
Disabled
Enabled
Disabled
Enabled
Enabled
EWST0
EEPROM write status flag
Data is not being written to the EEPROM. (Data can be written to or read from the EEPROM. However,
the EEPROM cannot be written to when EWE = 0.)
0
1
ERST0
EEPROM read status flag
Data cannot be read from the EEPROM.
Data can be read from the EEPROM.
0
1
Note
Data is being written to the EEPROM. (Data cannot be written to and read from the EEPROM.)
Note
Bits 1 and 3 are read-only.
Caution
ERST0 is 0 during a reset, immediately after a reset, in STOP mode, and immediately after release
of STOP mode. However, ERST0 is set to 1 when a certain oscillation settling time has elapsed.
ERST0 = 0 when ERE0 is set to 0, while EWST0 = 1, and during standby release time in the case the
value of ERE0 is changed from 0 to 1.
Remarks 1.
f
X
: Main system clock oscillation frequency
The parenthesized values apply to operation at f
X
= 5.0 MHz.
2.
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