M16C/62P Group (M16C/62P, M16C/62PT)
14. DMAC
Rev.2.41
Jan 10, 2006
Page 133 of 390
REJ09B0185-0241
Figure 14.6
Transfer Cycles for Source Read
BCLK
Address
bus
RD signal
WR signal
Data bus
CPU use
CPU use
Source
Destination
Dummy
cycle
(1) When the transfer unit is 8 or 16 bits and the source of transfer is an even address
BCLK
Address
bus
RD signal
WR signal
Data bus
CPU use
CPU use
Source
Destination
Dummy
cycle
(3) When the source read cycle under condition (1) has one wait state inserted
BCLK
Address
bus
RD signal
WR signal
Data bus
CPU use
CPU use
Source
Destination
Dummy
cycle
1
(2) When the transfer unit is 16 bits and the source address of transfer is an odd address, or when the
transfer unit is 16 bits and an 8-bit bus is used
BCLK
Address
bus
RD signal
WR signal
Data bus
CPU use
CPU use
Source
Destination
Dummy
cycle
1
(4) When the source read cycle under condition (2) has one wait state inserted
NOTES :
1. The same timing changes occur with the respective conditions at the destination as at the source.
CPU use
Source
Destination
Dummy
cycle
CPU use
CPU use
CPU use
Source
Destination
Dummy
cycle
1
CPU use
CPU use
Source
Destination
Dummy
cycle
CPU use
CPU use
Source
Destination
Dummy
cycle
1
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