Renesas R61509V User Manual
Page 103
R61509V
Target
Spec
Rev. 0.11 April 25, 2008, page 103 of 181
Data Transfer Synchronization in 16-bit Bus Interface Operation
The R61509V supports data transfer synchronization function to reset the counters for upper 16-/2-bit and
lower 2-/16-bit transfers in 16-bit 2-transfer mode. When a mismatch occurs in upper and lower data
transfers due to noise and so on, the 000H instruction is written four times consecutively to reset the upper
and lower counters in order to restart the data transfer from upper 2/16 bits. The data transfer
synchronization, when executed periodically, can help the display system recover from runaway.
Make sure to execute data transfer synchronization after reset operation before transferring instruction.
WRX
RDX
RS
(16-bit transfer synchronization)
DB17 ~ DB10,
DB8 ~ DB1
Upper
Lower
Upper
Upper
Lower
"000"H
"000"H
"000"H
"000"H
Figure 21 16-bit Data Transfer Synchronization