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位單片機微控制器
文件頁數(shù): 34/143頁
文件大小: 549K
代理商: ΜPD75F4246(A)
2
C
3.1.7 Blank check command
This command checks whether or not the
μ
PD75F4264’s program area (flash memory) has been erased.
Figure 3-8. Timing of Blank Check 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.
Wait5: This wait time is the product of multiplying 800 CPU clock pulses by the flash memory size in bytes. It is the wait time used during the flash
memory blank check operation.
SCK
SO
SI
RETRY Status Command
Wait1
“3C”
“30”
COMMAND
Wait5
(Retries: 16 maximum)
Wait5
“3C”
ACK = “3C”
Wait blank
check time
Wait2
Wait2
“70”
“3C”
STATUS CHECK
COMMAND
Wait2
“STATUS DATA”
BLANK CHECK ERROR #0
BLANK CHECKING NOW #4
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