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
Bit[1] High Speed
= 0 High Speed Disabled(default)
= 1 High Speed Enabled
on Vcc POR or
Reset_Drv
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.
189
SMSC [ SMSC CORPORATION ]
