hd66108 Renesas Electronics Corporation., hd66108 Datasheet - Page 17

• Manufacturer Part Number: hd66108
• Description: Ram-provided 165-channel Lcd Driver For Liquid Crystal Dot Matrix Graphics - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HD66108
(2) Busy Check
970
A busy time period appears after display memory read/write or X or Y address register write, since
post-access processing is performed synchronously with internal clock pulses. Updating data in
registers other than the address register is disabled during this time. Subsequent data must be input
after confirming ready mode by reading the address register. The busy time period is a maximum of 8
clock pulses after display memory read/write and a maximum of 1.5 clock pulses after X or Y address
register write (Figure 7).
Figure 7 Relationship between Clock Pulses and Busy Time (Updating Display Data)
CPU
HD66108T
OSC
BUSY
FLAG
Internal
operation
WR
RD
RS
DB7
Ready
Busy 8 clock pulses max
Operates internally
Ready