XR21V1412IL-0A Datasheet, PDF (15/32 Pages) Exar Corporation – 2-CH FULL-SPEED USB UART

REV. 1.3.0
NAME
CDC_ACM_IF
SEND_BREAK
XR_SET_REG
XR_GETN_REG
XR21V1412
2-CH FULL-SPEED USB UART
TABLE 4: SUPPORTED USB CONTROL COMMANDS
REQUEST
TYPE
REQUEST
VALUE
INDEX
LENGTH
DESCRIPTION
0x21
35
val val 0, 2, 0
0
0 Send a break for the speci-
LSB MSB ^{4, 6}
fied duration
0x40
0
val 0 regis- block 0 0 Exar custom command: set
ter
one 8-bit register
val: 8-bit register value
register address: see
Table 7
block number: see Table 5
0xC0
1
0 0 regis- block count count Exar custom register: get
ter
LSB MSB
count 8-bit registers
register address: see
Table 7
block number: see Table 5
2.1 UART Block Numbers
The table below lists the block numbers for accessing each of the UART channels and the UART Manager..
TABLE 5: CONTROL BLOCKS
BLOCK NAME
BLOCK NUMBER
DESCRIPTION
UART Channel A
0
The configuration and control registers for UART channel A.
UART Channel B
1
The configuration and control registers for UART channel B.
UART Manager
4
The control registers for the UART Manager. The UART Manager
enables/disables the TX and RX FIFOs for each UART.
I2C EEPROM
0x65
Accesses external EEPROM via I2C interface.
UART Custom
0x66
Custom UART control registers. Enables / disables for wide mode, low
latency mode and custom interrupt packet.
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