hd66765 Renesas Electronics Corporation., hd66765 Datasheet - Page 35
hd66765
Manufacturer Part Number
hd66765
Description
396-channel Segment Driver With Internal Ram For 4096-color Displays - Hitachi Semiconductor
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66765.pdf
(71 pages)
- Current page: 35 of 71
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Parallel Data Transfer
16-bit Bus Interface
Setting the IM2/1/0 (interface mode) to the GND/GND/GND level allows 68-system E-clock-
synchronized 16-bit parallel data transfer. Setting the IM2/1/0 to the GND/Vcc/GND level allows 80-
system 16-bit parallel data transfer. When the number of buses or the mounting area is limited, use an 8-
bit bus interface.
8-bit Bus Interface
Setting the IM2/1/0 (interface mode) to the GND/GND/Vcc level allows 68-system E-clock-synchronized
8-bit parallel data transfer using pins DB15–DB8. Setting the IM1/0 to the Vcc/Vcc level allows 80-
system 8-bit parallel data transfer. The 16-bit instructions and RAM data are divided into eight
upper/lower bits and the transfer starts from the upper eight bits. Fix unused pins DB7–DB0 to the Vcc
or GND level. Note that the upper bytes must also be written when the index register is written to.
Note: Transfer synchronization function for an 8-bit bus interface
The HD66765 supports the transfer synchronization function which resets the upper/lower
counter to count upper/lower 8-bit data transfer in the 8-bit bus interface. Noise causing transfer
mismatch between the eight upper and lower bits can be corrected by a reset triggered by
consecutively writing a 00H instruction four times. The next transfer starts from the upper eight
bits. Executing synchronization function periodically can recover any runaway in the display
system.
H8/2245
H8/2245
Figure 26 Interface to 16-bit Microcomputer
Figure 27 Interface to 8-bit Microcomputer
D15-D0
D15-D8
HWR*
HWR*
(RD*)
(RD*)
CSn*
CSn*
A1
A1
16
8
35
GND
8
CS*
RS
WR*
(RD*)
DB15-DB0
CS*
RS
WR*
(RD*)
DB15-DB8
DB7-0
HD66765
HD66765
HD66765
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