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Rev.1.02 Jul 01, 2005 page 82 of 314
REJ09B0126-0102
M16C/6N Group (M16C/6NL, M16C/6NN) 11. DMAC
Under development
This document is under development and its contents are subject to change.
Figure 11.4 SAR0 and SAR1 Registers, DAR0 and DAR1 Registers, TCR0 and TCR1 Registers
Symbol After Reset
SAR0
SAR1
Indeterminate
Indeterminate
Setting Range
RW
RW
-
00000h to FFFFFh
b0 b7 b0b3
(b19) (b16)
b7 b0
(b15) (b8)
b7
(b23)
DMAi Source Pointer (i = 0, 1)
(1)
Nothing is assigned. When write, set to "0".
When read, their contents are "0".
Set the source address of transfer
Function
Address
0022h to 0020h
0032h to 0030h
NOTE:
1. If the DSD bit in the DMiCON register is "0" (fixed), this register can only be written to when the DMAE bit in the
DMiCON register is "0" (DMA disabled).
If the DSD bit is "1" (forward direction), this register can be written to at any time.
If the DSD bit is "1" and the DMAE bit is "1" (DMA enabled), the DMAi forward address pointer can be read from
this register. Otherwise, the value written to it can be read.
Set the transfer count minus 1.
The written value is stored in the DMAi transfer counter
reload register, and when the DMAE bit in the DMiCON
register is set to "1" (DMA enabled) or the DMAi transfer
counter underflows when the DMASL bit in the DMiCON
register is "1" (repeat transfer), the value of the DMAi
transfer counter reload register is transferred to the DMAi
transfer counter.
When read, the DMAi transfer counter is read.
Function
Address
0029h, 0028h
0039h, 0038h
DMAi Transfer Counter (i = 0, 1)
Symbol After Reset
TCR0
TCR1
Indeterminate
Indeterminate
b0 b7
(b8)
b0b7
(b15)
Setting Range
RW
RW
0000h to FFFFh
Symbol After Reset
DAR0
DAR1
Indeterminate
Indeterminate
Setting Range
RW
RW
-
00000h to FFFFFh
b0 b7 b0b3
(b19) (b16)
b7 b0
(b15) (b8)
b7
(b23)
DMAi Destination Pointer (i = 0, 1)
(1)
Function
Set the destination address of transfer
Nothing is assigned. When write, set to "0".
When read, their contents are "0".
Address
0026h to 0024h
0036h to 0034h
NOTE:
1. If the DAD bit in the DMiCON register is "0" (fixed), this register can only be written to when the DMAE bit in the
DMiCON register is "0" (DMA disabled).
If the DAD bit is "1" (forward direction), this register can be written to at any time.
If the DAD bit is "1" and the DMAE bit is "1" (DMA enabled), the DMAi forward address pointer can be read from
this register. Otherwise, the value written to it can be read.