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): 23/165頁
文件大小: 841K
代理商: MC68HC05PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
P-DECODER
MOTOROLA
REV 1.1
12-3
12.2.3 Codeword
A frame consists of two codewords, each 32 bits long. A codeword is either an
address, a message or an idle codeword. Idle codewords are transmitted to ll
empty batches or to separate messages.
An address codeword always starts with a ‘0’. It has 18 bits of the 21 bit user
address (bit 2 to 19) which is protected against transmission errors by 10 bits of
BCH check bits (bit 22 to 31). The missing three bits of user address are coded in
the frame number in the batch, in which the address codeword is transmitted. Two
function bits (bit 20 and 21) allow for distinguishing one of the four different calls to
the same user address. The nal bit (bit 32) is chosen to give even parity.
A message codeword always starts with a ‘1’ and the whole message always
directly follows the address codeword. In a message codeword, 20 bits of any
display information can be put into the message bits (bit 2 to 21).
12.3
FUNCTIONAL BLOCKS
The P-Decoder consists of a clock divider, power saving generator, check bits
decoder and corrector, preamble and synchronization code detector. The
functional block is shown in Figure 12-2.
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