Panasonic JB-3300 Technical Manual page 174

XABO
*CRTC CS
*IOW
CRT'C-E
Input
CRTC
Address
Writing to the CRTC control register (RO to R15) (valid when XABO is
HIGH) is performed in a similar manner. Data obtained from
conversion using ROM address input XABO, the latched CRTC address
(latched when data is written in the address register), and DOO to
DO7 value is output to VDO to VD7. The data is then written into the
control register at the trailing edge of the CRTC-E signal. In this
case, the CRTC address is not latched.
When the CRTC register is read, data is output from the CRTC to VDO
to VD7. In this case, the CRTC parameter converter is inoperative.
Figure 5-29 shows timing for writing to the CRTC register.
|
|
e-\ crTCc Address No.(n-1) X CRTC Address NO. (N)
No. Latch
CRTC Address No. Resistor
i
| Latch
Figure 5-29 Writing to the CRTC Timing Chart
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