
MITSUBISHI
DIGITAL ASSP
M66335FP
FACSIMILE IMAGE DATA PROCESSOR
14
Use the PTIMB signal as control signals for the pulse motor for the
reading roller. The sequence for reduction is shown in Fig. 9 and that
for enlargement in Fig. 10.
Fig. 9 Reduction processing sequence
Fig. 10 Enlargement processing sequence
ACCK
SH
(START), (SSCAN) : internal signals
: Output section
<SCAN>, <SRDYB>, <CNV_D>, <INTCLR> : register setting
1
2
<SCAN>
(START)
INT
STIMB
SCLK
PTIMB
SVID
(SSCAN)
<SRDYB>
<CNV_D>
<INTCLR>
3
5
6
4
7
0
1
1
0
0
Reduced
line
Reduced
line
1
At the initial setting, the enlargement/reduction setting (CNV_D) in horizontal scanning is implemented. Then, after the system is switched into the setting
mode for enlargement/reduction in vertical scanning, the first line is set.
2
With a
↓
flow of ACCK, the SCAN command is taken in, when the system comes into the standby mode for SRDYB. (START: ‘H’)
3
With a
↑
flow of SH, SRDYB: ‘L’ is taken in, when scanning starts and PTIMB is output. (SSCAN: ‘H’)
4
During the period that STIMB is at ‘L’, converted binary data are output while the data for reduced lines are not output because STIMB for them are at ‘H’.
5
With a
↑
flow of ACCK, SRDYB: ‘H’ is taken in, when the reading of the single line is completed. (SSCAN: ‘L’)
6
With a
↓
flow of SSCAN, INT is asserted. (INT: ‘H’)
7
With CPU ready for reading the next line, the enlargement/reduction setting (CNV_D) in vertical scanning is implemented; INTCLR is generated; INT is
negated; and then SRDYB is set at ‘L’.
1
2
3
5
6
4
7
0
1
1
0
0
ACCK
SH
<SCAN>
(START)
INT
STIMB
SCLK
PTIMB
SVID
(SSCAN)
<SRDYB>
<CNV_D>
<INTCLR>
Enlarged
line
Enlarged
line
(START), (SSCAN) : internal signals
: Output section
<SCAN>, <SRDYB>, <CNV_D>, <INTCLR> : register setting
1
At the initial setting, the enlargement/reduction setting (CNV_D) in horizontal scanning is implemented. Then, after the system is switched into the setting
mode for enlargement/reduction in vertical scanning, the first line is set.
2
With a
↓
flow of ACCK, the SCAN command is taken in, when the system comes into the standby mode for SRDYB. (START: ‘H’)
3
With a
↓
flow of SH, SRDYB: ‘L’ is taken in, when scanning starts and PTIMB is output while it is not output for enlarged lines. (SSCAN: ‘H’)
4
During the period that STIMB is at ‘L’, converted binary data are output.
5
With a
↑
flow of ACCK, SRDYB: ‘H’ is taken in, when the reading of the single line is completed. (SSCAN: ‘L’)
6
With a
↓
flow of SSCAN, INT is asserted. (INT: ‘H’)
7
With CPU ready for reading the next line, the enlargement/reduction setting (CNV_D) in vertical scanning is implemented; INTCLR is generated; INT is
negated; and then SRDYB is set at ‘L’.