M95128-RMB6TG datasheet(22/49 Pages) STMICROELECTRONICS

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Instructions

M95128-W M95128-R M95128-DF

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Doc ID 5798 Rev 16

6.5

Read from Memory Array (READ)

As shown in Figure 12, to send this instruction to the device, Chip Select (S) is first driven

low. The bits of the instruction byte and address bytes are then shifted in, on Serial Data

Input (D). The address is loaded into an internal address register, and the byte of data at

that address is shifted out, on Serial Data Output (Q).

Depending on the memory size, as shown in Table 5, the most significant address bits are Don’t Care.

If Chip Select (S) continues to be driven low, the internal address register is incremented

automatically, and the byte of data at the new address is shifted out.

When the highest address is reached, the address counter rolls over to zero, allowing the

Read cycle to be continued indefinitely. The whole memory can, therefore, be read with a

single READ instruction.

The Read cycle is terminated by driving Chip Select (S) high. The rising edge of the Chip

Select (S) signal can occur at any time during the cycle.

The instruction is not accepted, and is not executed, if a Write cycle is currently in progress.

6.6

Write to Memory Array (WRITE)

As shown in Figure 13, to send this instruction to the device, Chip Select (S) is first driven

low. The bits of the instruction byte, address byte, and at least one data byte are then shifted

in, on Serial Data Input (D).

The instruction is terminated by driving Chip Select (S) high at a byte boundary of the input

data. The self-timed Write cycle, triggered by the Chip Select (S) rising edge, continues for a

period tW (as specified in AC characteristics in Section 9: DC and AC parameters), at the

end of which the Write in Progress (WIP) bit is reset to 0.

Figure 12.

Read from Memory Array (READ) sequence

AI01793D

3456789 10

20 21 22 23 24 25 26 27

14 13

3210

28 29 30

76543

High Impedance

Data Out 1

Instruction

16-Bit Address

MSB

Data Out 2

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