M37160M8 Datasheet, PDF (59/131 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

M37160M8/MA/MF-XXXSP/FP,M37160EFSP/FP
The horizontal display start position is common to all blocks, and can
be set in 128 steps (where 1 step is 4TOSC, TOSC being the OSD
oscillation cycle) as values “0016” to “FF16” in bits 0 to 6 of the hori-
zontal position register (address 00D116). The horizontal position reg-
ister is shown in Figure 8.10.9.
Horizontal Position Register
b7 b6 b5 b4 b3 b2 b1 b0
Horizontal position register (HP) [Address 00D116]
B
Name
Functions
After reset R W
0 Horizontal display start Horizontal display start position
to position control bits
4Tosc ✕ n
0 RW
6 (HP0 to HP6)
(n: setting value, Tosc: OSD oscillation cycle)
7 Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is “0.”
0 R—
Note: The setting value synchronizes with the V SYNC.
Fig. 8.10.9 Horizontal Position Register
Notes 1 : 1TC (TC : OSD clock cycle divided in pre-divide circuit) gap occurs
between the horizontal display start position set by the horizontal
position register and the most left dot of the 1st block. Accordingly,
when 2 blocks have different pre-divide ratios, their horizontal dis-
play start position will not match.
2 : When setting “0016” to the horizontal position register, it needs an
approximately 62TOSC (= Tdef) interval from a rising edge (when nega-
tive polarity is selected) of HSYNC signal to the horizontal display start
position.
HSYNC
Note 1
Tdef
4TOSC 5 N
1TC
Block 2 (Pre-divide ratio = 2 )
1TC
Block 3 (Pre-divide ratio = 3 )
N : Value of horizontal position register (decimal notation)
1TC : OSD clock cycle divided in pre-divide circuit
TOSC : OSD oscillation cycle
Tdef : 62 TOSC
Fig. 8.10.10 Notes on Horizontal Display Start Position
Rev.1.01 2003.11.13 page 59 of 130