HCS515-ISM datasheet(11/28 Pages) MICROCHIP

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DS40183D-page 11

HCS515

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

truncated to 7 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). Sequen-

tial 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). 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 (LSb) 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 keeping 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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