23K256-ESLASHST datasheet(13/27 Pages) MICROCHIP

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DS20002100G-page 13

23A256/23K256

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

3.1

Chip Select (CS)

A low level on this pin selects the device. A high level

deselects the device and forces it into Standby mode.

When the device is deselected, SO goes to the

high-impedance state, allowing multiple parts to share

the same SPI bus. After power-up, a low level on CS is

required, prior to any sequence being initiated.

3.2

Serial Output (SO)

The SO pin is used to transfer data out of the 23X256.

During a read cycle, data is shifted out on this pin after

the falling edge of the serial clock.

3.3

Serial Input (SI)

The SI pin is used to transfer data into the device. It

receives instructions, addresses and data. Data is

latched on the rising edge of the serial clock.

3.4

Serial Clock (SCK)

The SCK is used to synchronize the communication

between a host and the 23X256. Instructions,

addresses or data present on the SI pin are latched on

the rising edge of the clock input, while data on the SO

pin is updated after the falling edge of the clock input.

3.5

Hold (HOLD)

The HOLD pin is used to suspend transmission to the

23X256 while in the middle of a serial sequence without

having to retransmit the entire sequence again. It must

be held high any time this function is not being used.

Once the device is selected and a serial sequence is

underway, the HOLD pin may be pulled low to pause

further serial communication without resetting the

serial sequence. The HOLD pin must be brought low

while SCK is low, otherwise the HOLD function will not

be invoked until the next SCK high-to-low transition.

The 23X256 must remain selected during this

sequence. The SI, SCK and SO pins are in a

high-impedance state during the time the device is

paused and transitions on these pins will be ignored. To

resume serial communication, HOLD must be brought

high while the SCK pin is low, otherwise serial

communication will not resume. Lowering the HOLD

line at any time will tri-state the SO line.

Hold functionality is disabled by the STATUS register

bit.

TABLE 3-1:

PIN FUNCTION TABLE

Name

PDIP

SOIC

TSSOP

Function

Chip Select Input

Serial Data Output

VSS

444

Ground

Serial Data Input

SCK

Serial Clock Input

HOLD

Hold Input

VCC

Supply Voltage

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