AT89C5132-ROTUL datasheet(85/182 Pages) ATMEL

85 / 182 page

4173E–USB–09/07

AT89C5132

16.2.3

Command Token Format

As shown in Figure 16-6, commands have a fixed code length of 48 Bits. Each command token

is preceded by a Start bit: a low level on MCMD line and succeeded by an End bit: a high level

on MCMD line. The command content is preceded by a Transmission bit: a high level on MCMD

line for a command token (host to card) and succeeded by a 7-bit CRC so that transmission

errors can be detected and the operation may be repeated.

Command content contains the command index and address information or parameters.

Figure 16-6. Command Token Format

Table 71. Command Token Format

16.2.4

Response Token Format

There are five types of response tokens (R1 to R5). As shown in Figure 16-7, responses have a

code length of 48 Bits or 136 Bits. A response token is preceded by a Start bit: a low level on

MCMD line and succeeded by an End bit: a high level on MCMD line. The command content is

preceded by a Transmission bit: a low level on MCMD line for a response token (card to host)

and succeeded (R1,R2,R4,R5) or not (R3) by a 7-bit CRC.

Response content contains mirrored command and status information (R1 response), CID regis-

ter or CSD register (R2 response), OCR register (R3 response), or RCA register (R4 and R5

response).

Figure 16-7. Response Token Format

Total Length = 48 Bits

Content

CRC

Bit Position

45:40

39:8

7:1

Width (Bits)

Value

‘0’

‘1’

Description

Start bit

Transmission

bit

Command

Index

Argument

CRC7

End bit

Total Length = 48 Bits

Content

CRC

R1, R4, R5

Total Length = 136 Bits

Content = CID or CSD

CRC

Total Length = 48 Bits

Content

AT89C5132-ROTUL Folha de dados(PDF) 85 Page - ATMEL Corporation

AT89C5132-ROTUL Folha de dados(HTML) 85 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Folha de dados Download

Ligação URL