Section 14 Direct Memory Access Controller (DMAC)
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not cleared in the procedure 4, then the transfer is stopped according to the condition of both
the HE and the TE bits are set to 1.
As explained above, a repeat mode transfer enables sequential voice compression by changing
buffer for storing data received consequentially and a data buffer for processing signals
alternately.
14.4.6
Reload Mode Transfer
In a reload mode transfer, according to the settings of bits RPT[2:0] in CHCR, the value set in
SARB/DARB is set to SAR/DAR and the value of bits TCRB[23:16] is set in bits TCRB[7:0] at
each transfer set in the bits TCRB[7:0], and the transfer is repeated until TCR becomes 0 without
specifying the transfer settings again. A reload mode transfer is effective when repeating data
transfer with specific area. Figure 14.12 shows the operation of reload mode transfer.
DMAC
Bits RPT[2:0]
SHwy bus
CHCR
TCR
TCRB
SAR/DAR
SARB/DARB
Reload controller
Reload signal
Reload counter
Transfer counter
Transfer request
Figure 14.12 Reload Mode Transfer
When a reload mode transfer is executed, TCRB is used as a reload counter. Set TCRB according
to section 14.3.6, DMA Transfer Count Registers B0 to B3, B6 to B9 (TCRB0 to TCRB3, TCRB6
to TCRB9).
Содержание SH7780 Series
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