SST26VF032B datasheet(12/77 Pages) MICROCHIP

12 / 77 page

SST26VF032B / SST26VF032BA

DS20005218E-page 12

 2013-2016 Microchip Technology Inc.

4.5.8

I/O CONFIGURATION (IOC)

The I/O Configuration (IOC) bit re-configures the I/O

pins. The IOC bit is set by writing a ‘1’ to Bit 1 of the

Configuration register. When IOC bit is ‘0’ the WP# pin

and HOLD# pin are enabled (SPI or Dual Configuration

setup). When IOC bit is set to ‘1’ the SIO2 pin and SIO3

pin are enabled (SPI Quad I/O Configuration setup).

The IOC bit must be set to ‘1’ before issuing the follow-

ing SPI commands: SQOR (6BH), SQIOR (EBH),

RBSPI (ECH), and SPI Quad page program (32H).

Without setting the IOC bit to ‘1’, those SPI commands

are not valid. The I/O configuration bit does not apply

when in SQI mode. The default at power-up for

SST26VF032B is ‘0’ and for SST26VF032BA is ‘1’.

4.5.9

BLOCK-PROTECTION VOLATILITY

STATE (BPNV)

The Block-Protection Volatility State bit indicates

whether any block has been permanently locked with

the nVWLDR. When no bits in the nVWLDR have been

set, the BPNV is ‘1’; this is the default state from the

factory. When one or more bits in the nVWLDR are set

to ‘1’, the BPNV bit will also be ‘0’ from that point for-

ward, even after power-up.

4.5.10

WRITE-PROTECT ENABLE (WPEN)

The Write-Protect Enable (WPEN) bit is a non-volatile

bit that enables the WP# pin.

The Write-Protect (WP#) pin and the Write-Protect

Enable (WPEN) bit control the programmable hard-

ware write-protect feature. Setting the WP# pin to low,

and the WPEN bit to ‘1’, enables Hardware write-pro-

tection. To disable Hardware write protection, set either

the WP# pin to high or the WPEN bit to ‘0’. There is

latency associated with writing to the WPEN bit. Poll

the BUSY bit in the Status register, or wait TWPEN, for

the completion of the internal, self-timed Write opera-

tion. When the chip is hardware write protected, only

Write operations to Block-Protection and Configuration

registers are disabled. See “Hardware Write Protec-

tion” on page 8 and Table 4-1 on page 9 for more infor-

mation about the functionality of the WPEN bit.

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