HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 160

• Manufacturer Part Number: HD64F7050
• Description: 32-Bit RISC Microcomputer SuperH RISC engine Family/
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 9 Direct Memory Access Controller (DMAC)
Chan-
nel
3
Shared DMA operation
Notes: Registers are accessed in three cycles when using word access and six cycles when using
9.2
9.2.1
DMA source address registers 0–3 (SAR0–SAR3) are 32-bit read/write registers that specify the
source address of a DMA transfer. These registers have a count function, and during a DMA
transfer, they indicate the next source address. In single-address mode, SAR values are ignored
when a device with DACK has been specified as the transfer source.
Specify a 16-bit boundary when performing 16-bit data transfers, and a 32-bit boundary when
performing 32-bit data transfers. Operation cannot be guaranteed if any other addresses are set.
The initial value after power-on resets and in software standby mode is undefined.
Rev. 5.00 Jan 06, 2006 page 140 of 818
REJ09B0273-0500
longword access.
Do not attempt to access an empty address.
1. Write 0 after reading 1 in bit 1 of CHCR0–CHCR3 and in bits 1 and 2 of the DMAOR to
2. For 16-bit access of SAR0–SAR3, DAR0–DAR3, and CHCR0–CHCR3, the 16-bit value
3. DMATCR has a 24-bit configuration: bits 0–23. Writing to the upper 8 bits (bits 24–31)
4. Do not make 32-bit access for DMAOR.
Name
DMA source address
register 3
DMA destination
address register 3
DMA transfer count
register 3
DMA channel control
register 3
register
Register Descriptions
DMA Source Address Registers 0–3 (SAR0–SAR3)
clear flags. No other writes are allowed.
on the side not accessed is held.
is invalid, and these bits always read 0.
Abbrevi-
ation
SAR3
DAR3
DMATCR3 R/W
CHCR3
DMAOR
R/W
R/W
R/W
R/W *
R/W *
1
1
Initial
Value
Undefined
Undefined
Undefined
H'00000000 H'FFFF86FC 32 bit
H'0000
Address
H'FFFF86F0 32 bit
H'FFFF86F4 32 bit
H'FFFF86F8 32 bit
H'FFFF86B0 16 bit
Register
Size
Access
Size
16, 32 *
16, 32 *
32 *
16, 32 *
8, 16 *
3
4
2
2
2