M41T0 datasheet(12/20 Pages) STMICROELECTRONICS

12 / 20 page

M41T0

12/20

READ Mode

In this mode, the master reads the M41T0 slave

after setting the slave address (see Figure 9.). Fol-

lowing the WRITE Mode Control Bit (R/W = 0) and

the Acknowledge Bit, the word address An is writ-

ten to the on-chip address pointer. Next the

START condition and slave address are repeated,

followed by the READ Mode Control Bit (R/W =1).

At this point, the master transmitter becomes the

master receiver. The data byte which was ad-

dressed will be transmitted and the master receiv-

er will send an Acknowledge Bit to the slave

transmitter. The address pointer is only increment-

ed on reception of an Acknowledge Bit. The

M41T0 slave transmitter will now place the data

byte at address An+1 on the bus. The master re-

ceiver reads and acknowledges the new byte and

the address pointer is incremented to An+2.

This cycle of reading consecutive addresses will

continue until the master receiver sends a STOP

condition to the slave transmitter.

An alternate READ Mode may also be implement-

ed, whereby the master reads the M41T0 slave

without first writing to the (volatile) address point-

er. The first address that is read is the last one

stored in the pointer (see Figure 11., page 13).

WRITE Mode

In this mode the master transmitter transmits to

the M41T0 slave receiver. Bus protocol is shown

in Figure 12., page 13. Following the START con-

dition and slave address, a logic '0' (R/W = 0) is

placed on the bus and indicates to the addressed

device that word address An will follow and is to be

written to the on-chip address pointer. The data

word to be written to the memory is strobed in next

and the internal address pointer is incremented to

the next memory location within the RAM on the

reception of an acknowledge clock. The M41T0

slave receiver will send an acknowledge clock to

the master transmitter after it has received the

slave address and again after it has received the

word address and each data byte (see Figure 9.).

Figure 9. Slave Address Location

AI00602

R/W

SLAVE ADDRESS

START

100

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