This unit 8219 273 3747.3 is based on a Ucontroller M5840H-141 from OKI and other ASICS such as SAB3013 and LM339N to drive all tuning and search / Linear functions and all remote control features.
PHILIPS SAB3013 6-FUNCTION ANALOGUE MEMORY; MICROCOMPUTER CONTROLLED
Features
• 6-function analogue memory; O/A converter with 6-bit resolution.
• The output of the analogue values is pulse-width modulated with adjustable repetition rate (max. 15 kHz).
• Microcomputer-adapted asynchronous serial interface for data input (CBUS).
• Parallel operation of up to four SAB3013 circuits is possible.
GENERAL DESCRIPTION
The
SAB3013 is designed to deliver analogue values in
microcomputer-controlled television receivers and radio receivers. The
circuit comprises an analogue memory and 0/A converter for 6 analogue
functions with Ii 6-bit resolution for each. The information for the
analogue memory is transferred by the microcomputer via an asynchronous
serial data bus.
The SAB3013 accomplishes a word format recognition,
so it is able to operate one common data bus together with circuits
having different word formats. The data word of the microcomputer used
for the SAB3013 consists of information for addressing the appropriate
SAB3013 circuit (2-bits), for addressing the analogue memories concerned
(3-bits) and processing of the wanted analogue value (6-bits). The
address of the circuit is externally programmable via two inputs. It is
possible to address up to four SAB3013 circuits via one common bus. The
built-in oscillator can be used for a frequency between 30 kHz and 1
MHz. The analogue values are generated as a pulse pattern with a
repetition rate of fCLK/64 .(max. J5,6 kHz at fCLK = 1 MHz), and the
analogue values are determined by the ratio of the HI G!-:I-time and the
cycle time. A d.c. voltage proportional to.the analogue value is
obtained by means of an external integration network (low-pass filter).
OPERATION
DESCRIPTION The data input is achieved serially via the inputs DATA,
OLEN and CLB. Clock pulses have to be applied at input CLB for data
processing at input DATA. Data processing is only possible when OLEN =
HIGH. Received data are only accepted by the intermediate data memory,
when a transmission is offered, which is required for the SAB3013:
12 clock pulses must be received at input CLB (word format control) during transmission (OLEN =HIGH).
The start-bit must be LOW.
The system address bits must be A == SAA and B = SAB.
The data word for the SAB3013 consists of the following bits (see Fig. 2):
1 start-bit
2 system address bits (A and B)
3 address bits for selection of the wanted analogue memory
6 data bits for processing the analogue value
The
acceptance in the intermediate data memory and processing to the
analogue memory are caused by a load pulse at input CLB (OLEN = LOW).
Output BUSY = LOW during the transfer time (busy is max. 64 x tCLK).
(The OKI Microcontroller is obviously "ROM Masked" by PHILIPS)
Oki Electric Industry Co., Ltd. (沖電気工業株式会社 Oki Denki Kōgyō Kabushiki-gaisha) (TYO: 6703), commonly referred to as OKI, OKI Electric or the OKI Group, is a Japanese company manufacturing and selling info-telecom and printer products. Headquartered in Tokyo, Japan, OKI operates in over 120 countries around the world.
OKI manufactured the first telephone in Japan in 1881, and now, after more than 120 years the company specializes not only in developing and manufacturing telecommunication equipment but also in information products and mechatronics products, such as Automated teller machine(ATMs) and printers. Its printer business is operated through OKI Data, under the brand name, OKI Printing Solutions. OKI had a semiconductor business, in which it spun off and sold to Rohm Co., Ltd., on October 1, 2008.
OKI provides products to telecom carriers, financial institutions, government agencies, large corporation as well as SMBs both directly and via distributors and dealers.
The channel memory is backed up by a NiCd battery on the board and the RAM is even embedded in the M5840H-141.
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