7220 Datasheet, PDF (212/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
5.5 Example of I²C-BUS control by software (M37220M3-XXXSP/FP)
5.5.7 Register map
The M52340SP has 2 kinds of registers; the status data register and the write data registers.
(1) Status data register
The status data register indicates various signal state from the M52340SP side. The state is confirmed
by regularly reading each bit.
Status data register
b7 b6 b5 b4 b3 b2 b1 b0
Status data register
B
Name
0 ^{Color system determination bit 0}
(CONDITION)
1 Color system determination bit 1
(SECAM)
2 Color system determination bit 2
(NTSC)
Functions
0 : Under determination
1 : Determination is completed
b2 b1 Image system
00
PAL
0 1 SECAM
10
NTSC
1 1 SECAM
3 3.58/4.43 determination bit
(3.58)
4 AFT signal detection
bit 0 (AFT0)
0 : 4.43 MHz
1 : 3.58 MHz
After reset R W
0 R—
0 RW
0 RW
0 RW
0 RW
5 AFT signal detection
bit 1 (AFT1)
-100kHz f0 +100kHz Freq. ^{0 R W}
D5: AFT1 1 1 0
0
D4: AFT0 1 0 0
1
6 Synchronous presence
0 : Without synchronization
determination bit (COINCIDENCE) 1 : It is synchronization
0 RW
7 ^{Frequency determination bit}
(50/60)
0 : 50 Hz
1 : 60 Hz
0 RW
Fig. 5.5.16 Status data register
7220 Group User’s Manual
5-39