DS20006554A datasheet(45/94 Pages) MICROCHIP

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ZL30260-ZL30263

Data Sheet

DS20006554A

GLOBISR

Global Functions Interrupt Status Register

43h

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Name

BCDONE

—

GPIO3IE

GPIO2IE

GPIO1IE

GPIO0IE

Default

see below

Bit 7: Boot Controller Done (BCDONE). This bit indicates the status of the on-chip boot controller, which performs

auto-configuration from ROM or EEPROM. It is cleared when the device is reset and set after the boot controller

finishes auto-configuration of the device. See section 5.11.

Note that BCDONE cannot be polled while the device is auto-configuring because the internal register bus is in use.

The BCDONE bit was designed to be followed by a GPIO pin configured as a status output. To cause GPIO0, for

example, to follow BCDONE, include the following settings at the beginning of the auto-configuration script:

GPIOCR1=0x04 (configures GPIO0 as a non-inverted status output) and GPIO0SS=00011 111b (causes GPIO0 to

follow the bit at register 0x43, bit 7, which is BCDONE).

Alternately, there is a way to poll the device to determine whether auto-configuration is complete. This involves

choosing a writeable bit that (a) has a harmless effect, such as GLOBISR.GPIO3IE, and (b) is not set during auto-

configuration. System software can then poll the device by writing the register to set the bit then reading the register

to see if the bit is set. The bit cannot be set by system software while the device is auto-configuring. Therefore when

it is found to be set auto-configuration must be complete.

Bit 3: GPIO3 Change Interrupt Enable (GPIO3IE). This bit enables the GPIOSR.GPIO3L latched status bit to send

an interrupt request into the device’s interrupt logic.

0 = Interrupt is disabled

1 = Interrupt is enabled

Bit 2: GPIO2 Change Interrupt Enable (GPIO2IE). This bit enables the GPIOSR.GPIO2L latched status bit to send

an interrupt request into the device’s interrupt logic.

0 = Interrupt is disabled

1 = Interrupt is enabled

Bit 1: GPIO1 Change Interrupt Enable (GPIO1IE). This bit enables the GPIOSR.GPIO1L latched status bit to send

an interrupt request into the device’s interrupt logic.

0 = Interrupt is disabled

1 = Interrupt is enabled

Bit 0: GPIO0 Change Interrupt Enable (GPIO0IE). This bit enables the GPIOSR.GPIO0L latched status bit to send

an interrupt request into the device’s interrupt logic.

0 = Interrupt is disabled

1 = Interrupt is enabled

DS20006554A Datasheet(PDF) 45 Page - Microchip Technology

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