CHAPTER 6 DMA FUNCTIONS (DMA CONTROLLER)
User’s Manual U12688EJ4V0UM00
170
6.3.5 DMA channel control registers 0 to 3 (DCHC0 to DCHC3)
These 8-bit registers are used to control the DMA transfer operation mode for DMA channel n (n = 0 to 3).
These registers can be read/written in 8-bit units. (However, bit 7 is read-only and bits 2 and 1 are write-only.
When the DMA channel control registers are read, bits 2 and 1 are always 0.)
0
EN0
Address
FFFFF5F0H
After reset
00H
1
STG0
2
INIT0
3
0
4
0
5
0
6
0
7
TC0
EN1
STG1
INIT1
0
0
0
0
TC1
EN2
STG2
INIT2
0
0
0
0
TC2
EN3
STG3
INIT3
0
0
0
0
TC3
DCHC0
FFFFF5F2H
00H
DCHC1
FFFFF5F4H
00H
DCHC2
FFFFF5F6H
00H
DCHC3
Bit Position
Bit Name
Function
7
TCn
Terminal Count
This status bit indicates whether DMA transfer through DMA channel n has
ended or not.
This bit can only be read. It is set (1) when DMA transfer ends with a terminal
count and reset (0) when it is read.
0: DMA transfer has not ended.
1: DMA transfer has ended.
2
INITn
Initialize
If this bit is set (1), the DMA transfer is forcibly terminated.
1
STGn
Software Trigger
In DMA transfer enable state (TCn bit = 0, ENn bit = 1), if this bit is set (1), DMA
transfer can be started by software.
0
ENn
Enable
Specifies whether DMA transfer through DMA channel n is to be enabled or
disabled. It is reset (0) when DMA transfer ends with a terminal count. It is also
reset (0) when transfer is forcibly ended by means of setting (1) NMI input or
INITn bit.
0: DMA transfer disabled.
1: DMA transfer enabled.
Remark
n = 0 to 3
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