參數(shù)資料
型號: M30201F6TFP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機
文件頁數(shù): 17/159頁
文件大小: 2319K
代理商: M30201F6TFP
Unde
deeopmen
Software Wait
Mitsubishi microcomputers
M30201 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
17
Software wait
The wait bit (bit 7) of the processor mode register 1 (address 0005
16
)(note) allows you to insert software
wait states for the internal ROM/RAM areas. If this bit is 0, the bus cycle is executed in one BCLK (internal
clock) period; if the bit is 1, the bus cycle is executed in two BCLK periods. This bit is cleared to 0 after a
reset.
The SFR area is unaffected by this control bit; it is always accessed in two BCLK periods.
Table 1.2 shows the relationship between software wait states and bus cycles.
Note: Before attempting to change the contents of the processor mode register 1, set bit 1 of the protect
register (address 000A
16
) to “1”.
Area
Wait bit
Bus cycle
1
2 BCLK cycles
SFR
Internal
ROM/RAM
0
1 BCLK cycle
Invalid
2 BCLK cycles
Table 1.2. Software waits and bus cycles
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