HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 247

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

10.4.6
Channel 2 has a source address reload function. This returns to the first value set in the source
address register (SAR_2) every four transfers by setting the RO bit of CHCR_2 to 1. Figure 10.24
illustrates this operation. Figure 10.25 is a timing chart for reload ON mode, with burst mode,
autorequest, 16-bit transfer data size, SAR_2 increment, and DAR_2 fixed mode.
address bus
data bus
Internal
Internal
CK
Transfer
request
Source Address Reload Function
SAR2
1st channel 2
SAR2 output
DAR2 output
Figure 10.25 Source Address Reload Function Timing Chart
transfer
DAR2
SAR2 data
Figure 10.24 Source Address Reload Function
DMAC
SAR2+2
SAR2+2 output
2nd channel 2
DAR2 output
DMAC control block
transfer
Reload control
4th count
After SAR2+6 output, SAR2 is reloaded
DAR2
SAR2+2 data
SAR2+4
SAR2+4 output
3rd channel 2
DAR2 output
transfer
DAR2
SAR2+4 data
10. Direct Memory Access Controller (DMAC)
SAR2+6
SAR2+6 output
4th channel 2
DAR2 output
Reload signal
Count signal
Rev.4.00 Mar. 27, 2008 Page 203 of 882
transfer
RO bit = 1
Reload
signal
DAR2
SAR2+6 data
Bus mastership is returned one time in four
(initial value)
DMATCR_2
CHCR_2
SAR_2
SAR_2
REJ09B0108-0400
SAR2
5th channel 2
SAR2 output
DAR2 output
transfer
SAR2 data
DAR2