HCS500 datasheet(10/24 Pages) MICROCHIP

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HCS500

DS40153B-page 10

Preliminary

4.2.5

READ BYTE/S FROM USER EEPROM

The read command (Figure 4-4) is used to read bytes

from the user EEPROM. The offset in the user

EEPROM is speciﬁed by the address byte which is trun-

cated to seven bits (C to D). After the address, a

dummy byte must be clocked in (D to E). The EEPROM

data byte is clocked out on the next rising edge of the

clock line with the least signiﬁcant bit ﬁrst (E to F).

Sequential reads are possible by repeating sequence E

to F within 1 ms after the falling edge of the previous

byte’s Most Signiﬁcant Bit (MSB) bit. During the

sequential read, the address value will wrap after 128

bytes. The decoder will terminate the read command if

no clock pulses are received for a period longer than

1.2 ms.

4.2.6

WRITE BYTE/S TO USER EEPROM

The write command (Figure 4-5) is used to write a loca-

tion in the user EEPROM. The address byte is trun-

cated to seven bits (C to D). The data is clocked in least

signiﬁcant bit ﬁrst. The clock line must be asserted to

initiate the write. Sequential writes of bytes are possible

by clocking in the byte and then asserting the clock line

(D – F). The decoder will terminate the write command

if no clock pulses are received for a period longer than

1.2 ms After a successful write sequence the decoder

will acknowledge by taking the data line high and keep-

ing it high until the clock line goes low.

FIGURE 4-4:

READ BYTES FROM USER EEPROM

FIGURE 4-5:

WRITE BYTES TO USER EEPROM

Decoder DATA

MSB

Command Byte

Start Command

LSB

TRD

Address Byte

Dummy Byte

CLK

µC DATA

Data Byte

MSB

LSB

MSB

LSB

MSB

LSB

TRD

Decoder DATA

MSB

Command Byte

Start Command

LSB

TWR

Address Byte

Data Byte

CLK

µC DATA

Acknowledge

MSB

LSB

MSB

LSB

TACK

TRESP

TACK2

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