MX809J データシートの表示（PDF） - MX-COM Inc

部品番号

コンポーネント説明

メーカー

MX809J

1200bps MSK Modem

MX-COM Inc  

MSK Modem

20

7.1.4 Timing

C-BUS Timing

tCSE

Chip Select Low to First Serial Clock Rising Edge

tCHS

Last Serial Clock Rising Edge to Chip Select High

tHIZ

Chip Select High to Reply Data High -Z

tCSOFF Chip Select High time between transactions

tNXT

Inter-Byte Time

tCK

Serial Clock Period

Min.

2.0

4.0

2.0

4.0

2.0

Typ.

MX809

Max.

2.0

Units

s

s

s

s

s

Table 12: Timing Information

Notes:

1. Depending on the command, 1 or 2 bytes of Command Data is transmitted to the peripheral MSB (bit 7)

first, LSB (bit 0) last. Reply Data is read from the peripheral MXB (bit 7) first, LSB (bit 0) last.

2. Data is clocked into and out of the peripheral on the rising Serial Clock edge.

3. Loaded commands are acted upon at the end of each command.

4. To allow for differing microcontroller serial interface formats, C-BUS compatible ICs are able to work with

either polarity Serial Clock pulses.

CHIP SELECT

t CSOFF

SERIAL CLOCK

t CSE

t NXT

t NXT

t CSH

COMMAND DATA

76543 210

MSB

LSB

ADDRESS/COMMAND

BYTE

REPLY DATA

Logic level is not important

t CK

7654 3210

MSB

LSB

FIRST DATA BYTE

76543210

MSB

LSB

FIRST REPLY DATA BYTE

76543210

MSB

LSB

LAST DATA BYTE

ä

t HIZ

76543210

MSB

LSB

LAST REPLY DATA BYTE

Figure 11: C-BUS Timing Information

1998 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480036.004

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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