參數(shù)資料
型號: MC68HC05PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 21/165頁
文件大?。?/td> 841K
代理商: MC68HC05PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
P-DECODER
MOTOROLA
REV 1.1
12-1
SECTION 12
P-DECODER
The P-Decoder is fully compatible with CCIR Radiopaging Code Number 1
(recommendation 584). The architecture allows for exible application in a wide
variety of Radiopager designs. It can receive messages containing tone, numeric
and character data at 512bps, 1200bps and 2400bps data speed.
12.1
P-DECODER FEATURES
Fully compatible with CCIR Radiopaging Code No.1
Programmable data rates: 512, 1200 and 2400 bps (bits per second)
Software programmable data polarity
Up to 6 user addresses capacity
Two independent frame addresses
Battery saving operation
Programmable battery saving time
Up to 2 bits error correction ability in both address and message
codewords with 10-bit BCH (Bose-Chaudhuri-Hocquenghem) codes
12.2
CCIR Radiopaging Code No.1
The transmission of data using CCIR Radiopaging Code No.1 is shown in
Figure 12-1. It consists of a preamble followed by batches of complete
codewords, each batch commencing with a synchronization codeword (SC).
Transmission may cease at the end of a batch when there are no further calls.
12.2.1 Preamble
Each transmission starts with a preamble to help the pagers attain bit
synchronization and thus help in acquiring word and batch synchronization. The
preamble is a pattern of bit reversals, 10101... repeated for a period of at least 576
bits, i.e. the duration of a batch plus a codeword.
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