FDC37B78X View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR

SMSC -> Microchip 

Serial Port 1, Logical Device 4

TABLE 78 - SERIAL PORT 1, LOGICAL DEVICE 4 [LOGICAL DEVICE NUMBER = 0X04]

NAME

REG INDEX

DEFINITION

STATE

Serial Port 1

0xF0 R/W Bit[0] MIDI Mode

C

Mode Register

= 0 MIDI support disabled (default)

= 1 MIDI support enabled

Default = 0x00

on Vcc POR or

Reset_Drv

Bit[1] High Speed

= 0 High Speed Disabled(default)

= 1 High Speed Enabled

Bit[6:2] Reserved, set to zero

Bit[7]: Share IRQ

=0 UARTS use different IRQs

=1 UARTS share a common IRQ

See Note 1 below.

Note 1: To properly share and IRQ,

1. Configure UART1 (or UART2) to use the desired IRQ pin.

2. Configure UART2 (or UART1) to use No IRQ selected.

3. Set the share IRQ bit.

Note: If both UARTs are configured to use different IRQ pins and the share IRQ bit is set, then both of

the UART IRQ pins will assert when either UART generates an interrupt.

190

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