GPR26L160A

© Generalplus Technology Inc.

Proprietary & Confidential

8

Aug. 13, 2009

Version: 1.4

9. INSTRUCTIONS

All instructions, addresses and data are shifted in and out of the

device, most significant bit first.

Serial Data Input (D) is sampled on the first rising edge of Serial

Clock (C) after Chip Select (SB) is driven Low.

Then, the

one-byte instruction code must be shifted in to the device, most

significant bit first, on Serial Data Input (D), each bit being latched

on the rising edges of Serial Clock (C).

The instruction set is listed in Table 1.

Every instruction sequence starts with a one-byte instruction code.

Depending on the instruction, this might be followed by address

bytes, or by data bytes, or by both or none.

In the case of a Read Data Bytes (READ), Read Data Bytes at

Higher Speed (Fast_Read), the shifted-in instruction sequence is

followed by a data-out sequence.

Chip Select (SB) can be driven

High after any bit of the data-out sequence is being shifted out.

Table1. Instruction Set

Instruction

Description

One-byte Instruction Code

Address

Bytes

Dummy

Bytes

Data

Bytes

READ

Read Data Bytes

0000 0011

03h

3

0

1 to ∞

FAST_READ

Read Data Bytes at Higher Speed

0000 1011

0Bh

3

1

1 to ∞

9.1. Read Data Bytes (READ)

The device is first selected by driving Chip Select (SB) Low.

The

instruction code for the Read Data Bytes (READ) instruction is

followed by a 3-byte address (A23-A0), each bit being latched-in

during the rising edge of Serial Clock (C).

Then the memory

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

each bit being shifted out, at a maximum frequency fR, during the

falling edge of Serial Clock (C).

The instruction sequence is shown in Figure 4.

The first byte

addressed can be at any location.

The address is automatically

incremented to the next higher address after each byte of data is

shifted out.

The whole memory can, therefore, be read with a

single Read Data Bytes (READ) instruction.

When the highest

address is reached, the address counter rolls over to 000000h,

allowing the read sequence to be continued indefinitely.

The Read Data Bytes (READ) instruction is terminated by driving

Chip Select (SB) High.

Chip Select (SB) can be driven High at

any time during data output.

SB

Note: Address bits A23, A22, A21 are Don't Care.

Figure4. Read Data Bytes (READ) Instruction Sequence and Data-Out Sequence