Datasheet

2−41
2.20.48 Closed Caption Data Registers
Address 90h−93h
Address 7 6 5 4 3 2 1 0
90h Closed caption field 1 byte 1
91h Closed caption field 1 byte 2
92h Closed caption field 2 byte 1
93h Closed caption field 2 byte 2
These registers contain the closed caption data arranged in bytes per field.
2.20.49 WSS Data Registers
Address 94h−99h
NTSC
ADDRESS 7 6 5 4 3 2 1 0 BYTE
94h b5 b4 b3 b2 b1 b0 WSS field 1 byte 1
95h b13 b12 b11 b10 b9 b8 b7 b6 WSS field 1 byte 2
96h b19 b18 b17 b16 b15 b14 WSS field 1 byte 3
97h b5 b4 b3 b2 b1 b0 WSS field 2 byte 1
98h b13 b12 b11 b10 b9 b8 b7 b6 WSS field 2 byte 2
99h b19 b18 b17 b16 b15 b14 WSS field 2 byte 3
These registers contain the wide screen signaling (WSS) data for NTSC.
Bits 0−1 represent word 0, aspect ratio
Bits 2−5 represent word 1, header code for word 2
Bits 6−13 represent word 2, copy control
Bits 14−19 represent word 3, CRC
PAL/SECAM
ADDRESS 7 6 5 4 3 2 1 0 BYTE
94h b7 b6 b5 b4 b3 b2 b1 b0 WSS field 1 byte 1
95h b13 b12 b11 b10 b9 b8 WSS field 1 byte 2
96h b7 b6 b5 b4 b3 b2 b1 b0 WSS field 2 byte 1
97h b13 b12 b11 b10 b9 b8 WSS field 2 byte 2
98h Reserved
99h Reserved
PAL/SECAM:
Bits 0−3 represent group 1, aspect ratio
Bits 4−7 represent group 2, enhanced services
Bits 8−10 represent group 3, subtitles
Bits 11−13 represent group 4, others