MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Low-speed running (φ1 ≤ 12.5 MHZ)
Internal memory access
External memory access
2-φ access
2-φ access
Read
Write
Read
Write
φ
φ
φ
φ
RD
WR
Ai
RD
RD
WR
Ai
RD
WR
Ai
WR
ADRS
Ai
Di
ADRS
ADRS
ADRS
Di
W-D
1bus cycle = 2φ
Di
R-D
Di
W-D
1bus cycle = 2φ
1bus cycle = 2φ
1bus cycle = 2φ
3-φ access
Read
Write
φ
φ
RD
WR
Ai
RD
WR
Ai
––––––––––––––––––––––––––––––
ADRS
ADRS
W-D
Di
R-D
Di
1bus cycle = 3φ
1bus cycle = 3φ
4-φ access
Read
Write
φ
φ
RD
WR
RD
WR
ADRS : Address
Ai
Di
Ai
Di
ADRS
ADRS
R-D : Read data
W-D : Write data
R-D
W-D
1bus cycle = 4φ
1bus cycle = 4φ
Fig. 6 Bus cycle selection (low-speed running)
14
RENESAS [ RENESAS TECHNOLOGY CORP ]
