ST92195C STMicroelectronics, ST92195C Datasheet - Page 159

• Manufacturer Part Number: ST92195C
• Description: 48-96 Kbyte Rom Hcmos Mcu With On-screen Display And Teletext Data Slicer
• Manufacturer: STMicroelectronics

ST92195C/D - TELETEXT SLICER AND ACQUISITION UNIT
TELETEXT SLICER AND ACQUISITION UNIT (Cont’d)
ACQUISITION PACKET REQUEST REGISTER
(ACQPRR)
R251 - Read/Write
Register Page: 34
Reset value: 0xxx 0000 (00h)
Bit 7 = HAMF: Hamming Check mode control.
This bit is set and cleared by software.
0: Hamming 8/4 correction
1: Hamming 24/18 correction
Bit 6 = Reserved bit.
Bit 5 = FR7B: Framing Code 7 Matching Bits Error.
This bit is set by hardware when only 7 of the 8
framing code bits are valid. This bit must be reset
by software.
0: No error
1: 7-bits of 8-bit framing code matched
Bit 4 = FRDET: Acknowledge Framing Code 7
Bits.
This bit is set and cleared by software.
0: Framing codes that match on only 7 bits are not
1: Acknowledge Framing codes that match on only
Bit 3 = SPF: Service Packet Flag.
This bit is set by hardware and cleared by soft-
ware. The type of service packet requested is pro-
grammed using the P[29:31] bits.
0: No service packet received
1: Service packet is received and was requested.
Bits 2:0 = P[31:P29]: X/29, X/30, X/31 Packet
Control.
These bits are programmed by software before
each VBI.
0: Service packets Px are never stored.
1: Service packets Px will be stored.
159/249
HAMF
acknowledged.
7 bits
7
-
FR7B FRDET SPF
P31
P30
P29
0
TELETEXT QUALITY MEASURE REGISTER
(ACQTQMR)
R252 - Read/Write
Register Page: 34
Reset value: 0000 0000 (00h)
Bits 7:4 = HEC[3:0]: Hamming Errors Counter.
These bits contain the error counter value. When
an overflow occurs, the incrementation is stopped
at the value Fh. The counter is reset by Hardware
at each Vsync. HEC[3] is the most significant bit.
Bits 3:0 = BLC[3:0]: Bad Line Counter.
These bits contain the error counter value. When
an overflow occurs, the incrementation is stopped
to the value Fh. The counter is reset by Hardware
at each Vsync. BLC[3] is the most significant bit.
HEC3
7
HEC2 HEC1 HEC0
BLC3
BLC2
BLC1
BLC0
0