Renesas M16C FAMILY, Руководство пользователя, Страница: 324 / 369

Rev.2.00 Oct 16, 2006 page 313 of 354
REJ09B0340-0200
M30245 Group 3. CRC Snoop Function Applications
Figure 3.6.2. Setting routine (1) of DMA transfer from RAM to UART using SFR snooping function
b7 b0
0
1 0 1 1 0 0
b7 b0
b7 b0
1
0 1 0 0 1 0
b8 b7 b0 b15 b23 b16 b19
b8 b7 b0 b15 b23 b16
b19
b7 b0
04
16
00
16
0 0 0 0
0 0 0 0 03
16
6A
16
●
Initialization of UART1
(See “2.3.2 Operation of Serial I/O (transmission in clock synchronous serial I/O mode” for detail.)
●
Enable UART1 transmit
UART1 transmit / receive control register 1
U1C1 [Address
036D
16
]
DMA0 control register
DM0CON [Address
002C
16
]
DMA0 cause select register
DM0SL [Address 03B8
16
]
DMA0 control register
DM0CON [Address
002C
16
]
DMA0 source pointer
SAR0 [Address
0022
16
to 0020
16
]
DMA0 destination pointer
DAR0 [Address
0026
16
to 0024
16
]
Transmit enable bit
1 : Transmit enable
DMA enable bit
0 : Disabled
DMA request cause select bits
0 1 1 1 0 : UART1 transmit
Nothing is assigned. Write “0” when writing to these bits.
Software DMA request bit
0 : Not occurred
●
Disable DMA0
●
Setting DMA0 cause select register
●
Setting DMA0 control register
Transfer unit select bit
1 : 8 bits
Repeat transfer mode select bit
0 : Single transfer
DMA request bit
0 : DMA not requested
DMA enable bit
0 : Disabled
Source address direction select bit
1 : Forward
Destination address direction select bit
0 : Fixed
●
Setting source pointer(internal RAM address) and destination pointer (UART1 transmit buffer)
Stores the internal RAM address (0400
16
)
Nothing is assigned. Write “0” when writing to these bits.
Stores the address of UART1 transmit buffer register (036A
16
)
Nothing is assigned. Write “0” when writing to these bits.
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