M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 552

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

External Buses
Figure 5.5.6. Example of RDY circuit holding state of bus for 1 BCLK
(2) RDY function usage
To use the RDY function, set a software wait.
The RDY function operates when the BCLK signal falls with the RDY pin at “L”; the bus does not vary
for 1 BCLK, and the state at that moment is held.
The RDY function holds the state of bus for the period in which the RDY pin is at “L”, and releases it
when the BCLK signal falls with the RDY pin at “H”. Figure 5.5.6 shows an example of RDY circuit
that holds the state of bus for 1 BCLK.
• Timings in separate bus
1Q
RDY
BCLK
CS0
RD
1Q
2Q
BCLK
CS0
RD
2Q
• Timings in multiplex bus
RDY
________
________
(1) RDY accepted
(2) RDY cleared
________
BCLK
CS0
RD
The state of data bus and that of address bus are held for the period between (1) and (2).
________
________
(1)
CK
D
(1)
S
R
(2)
1Q
1Q
________
(2)
CK
D
S
R
(1)
(1)
2Q
2Q
(2)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
________
(2)
________
Mitsubishi microcomputers
M16C / 62 Group
RDY
________
537