M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 379
M30280F6HP
Manufacturer Part Number
M30280F6HP
Description
16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.M30280F6HP.pdf
(423 pages)
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M
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20.5 DMAC
e
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. v
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0
20.5.1 Write to DMAE Bit in DMiCON Register (i = 0, 1)
C
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When both of the conditions below are met, follow the steps below.
(a) Conditions
(b) Procedure
If the DMAi is not in an initial state, the above steps should be repeated.
NOTES:
0 .
B
0
0
8
• The DMAE bit is set to “1” again while it remains set (DMAi is in an active state).
• A DMA request may occur simultaneously when the DMAE bit is being written.
(1) Write “1” to the DMAE bit and DMAS bit in DMiCON register simultaneously
(2) Make sure that the DMAi is in an initial state
0
1. The DMAS bit remains unchanged even if “1” is written. However, if “0” is written to this bit, it is
2. Read the TCRi register to verify whether the DMAi is in an initial state. If the read value is equal to
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o r
0 -
. n
initial state.
set to “0” (DMA not requested). In order to prevent the DMAS bit from being modified to “0”, “1”
should be written to the DMAS bit when “1” is written to the DMAE bit. In this way the state of the
DMAS bit immediately before being written can be maintained.
Similarly, when writing to the DMAE bit with a read-modify-write instruction, “1” should be written to
the DMAS bit in order to maintain a DMA request which is generated during execution.
a value which was written to the TCRi register before DMA transfer start, the DMAi is in an initial
state. (If a DMA request occurs after writing to the DMAE bit, the value written to the TCRi register
is the value minus “1”.) If the read value is a value in the middle of transfer, the DMAi is not in an
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page 359
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(2)
in a program.
(1)
.
20. Precautions
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