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If M (1 to 255) is the size of the block transferred at each request and N (1 to 65,536) is the
number of blocks to be transferred, then ETCRAH and ETCRAL should initially be set to M and
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ETCRB should initially be set to N.
Figure 8-10 illustrates how block transfer mode operates. In this figure, bit TMS is cleared to 0,
meaning the block area is the destination.
T
A
B
A
Legend
L
= initial setting of MARA
A
L
= initial setting of MARB
B
M
= initial setting of ETCRAH and ETCRAL
N
= initial setting of ETCRB
T
= L
A
A
B
= L + SAIDE • (–1)
A
A
T
= L
B
B
B
= L + DAIDE • (–1)
B
B
Transfer
Block 1
Block 2
M bytes or words are
transferred per request
Block N
SAID
DTSZ
• (2
• M – 1)
DAID
DTSZ
• (2
• M – 1)
Figure 8-10 Operation in Block Transfer Mode
Block area
219
Address T
B
Address B
B
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