3069RF-ZTAT Datasheet, PDF (251/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

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
ETCRB should initially be set to N.
Figure 7.10 illustrates how block transfer mode operates. In this figure, bit TMS is cleared to 0,
meaning the block area is the destination.
T_A
Block 1
B_A
Transfer
Block area
Address T _B
Address B _B
Block 2
M bytes or words are
transferred per request
Block N
[Legend]
L _A = initial setting of MARA
L _B = initial setting of MARB
M = initial setting of ETCRAH and ETCRAL
N = initial setting of ETCRB
T_A
B_A
=
=
L_A
L_A +
SAIDE
•
(–1) ^SAID
•
(2 ^DTSZ
•
M
–
1)
T_B = L_B
B _B = L _B + DAIDE • (–1) ^DAID • (2 ^DTSZ • M – 1)
Figure 7.10 Operation in Block Transfer Mode
Rev. 5.0, 09/04, page 229 of 978