參數(shù)資料
型號： μPD75F4246(A)
廠商： NEC Corp.
元件分類： 8位微控制器
英文描述： 8 Bit Single Chip Microcontrollers
中文描述： 8位單片機(jī)微控制器
文件頁數(shù)： 28/143頁
文件大?。?/td> 549K
代理商： ΜPD75F4246(A)
1
C
3.1.2 Oscillation frequency setting command
This command notifies the
μ
PD75F4264 concerning its operating clock. The
μ
PD75F4264 internally uses this frequency value as the basic frequency value for
calculating the write time, erase time, etc.
Figure 3-2. Timing of Oscillation Frequency Setting Command
Remarks 1.
Wait1: This wait time is at least 800 pulses of the CPU clock. It is the wait time between issuing a command and receiving an ACK signal.
2.
Wait2: This wait time is at least 700 pulses of the CPU clock. It is the wait time that occurs between receiving an ACK signal and sending or receiving
data, between data transmissions, between sending or receiving data and receiving an ACK signal, and between issuing commands.
3.
Wait3: This wait time is at least 3000 pulses of the CPU clock. It is the wait time that is used to calculate the oscillation frequency setting and the
erase time setting.
SCK
SO
SI
“3C”
Wait3
Wait1
Wait Frequency
calculating time
ACK = “3C”
“90”
COMMAND
Wait2
Wait2
“3C”
ACK = “3C”
“06”
FREQUENCY
Wait2
“00”
FREQUENCY
Wait2
“00”
FREQUENCY
“04”
DECIMAL POINT
DATA
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