參數(shù)資料
型號: μPD789197
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位單片機微控制器(8位單片微控制器)
文件頁數(shù): 79/146頁
文件大?。?/td> 630K
代理商: ΜPD789197
Preliminary Product Information
79
μ
PD789186, 789187, 789196, 789197
Figure 6-38. SMB Control Register 0 Format (1/4)
SMBE0 LREL0
WREL0
SPIE0
WTIM0 ACKE0
STT0 SPT0
SMBC0
Symbol
Address
When reset
R/W
FF78H
00H
R/W
6
5
4
3
2
1
SMBE0
0
1
Cleared conditions (SMBE0 = 0)
Cleared with instruction
Cleared by RESET input
Set conditions (SMBE0 = 1)
Set with instruction
SMB operation
Operation disabled. Presets extension register (SMBS0). Internal operation also disabled.
Operation enabled.
7
0
LREL0
0
1
Goes from communication to standby status until the following communication participation conditions are realized.
Startup as master following detection of stop condition
Matching addresses or extension code reception following start condition
Clear conditions (LREL0 = 0)
Note
Automatically cleared after execution
Cleared by RESET input
Set conditions (LREL0 = 1)
Set with instruction
Transmission cut
Normal operation
Cuts current transmission and enters standby status. Automatically cleared after execution.
This register is used when extension codes not relevant to local addresses are received.
The SCL0 and SDA0 lines become high impedance.
The following flags are cleared.
STD0 STT0 SPT0 ACKD0 TRC0 COI0 EXC0 MSTS0
WREL0
0
1
Clear conditions (WREL0 = 0)
Note
Automatically cleared after execution
Cleared by RESET input
Set conditions (WREL0 = 1)
Set with instruction
Wait cancel
Does not cancel wait.
Cancels wait. Automatically cleared after wait cancellation.
SPIE0
0
1
Cleared conditions (SPIE0 = 0)
Note
Cleared with instruction
Cleared by RESET input
Set conditions (SPIE0 = 1)
Set with instruction
Interrupt request generation at stop condition detection
Disabled
Enabled
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