W83977F Datasheet, PDF (79/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
PRELIMINARY
4.7 Set 5 - Flow control and IR control and Frame Status FIFO registers
Address Offset
0
1
2
3
4
5
6
7
Register Name
Register Description
FCBLL
FCBHL
Flow Control Baud Rate Divisor Latch Register (Low Byte)
Flow Control Baud Rate Divisor Latch Register (High Byte)
FC_MD Flow Control Mode Operation
SSR
IRCFG1
FS_FO
RFRLFL
Sets Select Register
Infrared Configure Register
Frame Status FIFO Register
Receiver Frame Length FIFO Low Byte
RFRLFH Receiver Frame Length FIFO High Byte
4.7.1 Set5.Reg0, 1 - Flow Control Baud Rate Divisor Latch Register (FCDLL/ FCDHL)
If flow control is enforced when UART switches mode from MIR/FIR to SIR, then the pre-programmed
baud rate of FCBLL/FCBHL are loaded into advanced baud rate divisor latch (ADBLL/ADBHL).
4.7.2 Set5.Reg2 - Flow Control Mode Operation (FC_MD)
These registers control flow control mode operation as shown in the following table.
Reg.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
FC_MD FC_MD2 FC_MD1 FC_MD0
-
FC_DSW EN_FD EN_BRFC
Reset Value
0
0
0
0
0
0
0
Bit 0
EN_FC
0
Bit 7~5
Bit 4:
Bit 3:
FC_MD2 - Flow Control Mode
When flow control is enforced, these bits will be loaded into AD_MD2~0 of advanced
HSR (Handshake Status Register). These three bits are defined as same as AD_MD2~0.
Reserved, write 0.
FC_DSW - Flow Control DMA Channel Swap
A write to 1 allow user to swap DMA channel for transmitter or receiver when flow control
is enforced.
FC_DSW
0
1
Next Mode After Flow Control Occurred
Receiver Channel
Transmitter Channel
Bit 2:
Bit 1:
Bit 0:
EN_FD - Enable Flow DMA Control
A write to 1 enables UART to use DMA channel when flow control is enforced.
EN_BRFC - Enable Baud Rate Flow Control
A write to 1 enables FC_BLL/FC_BHL (Flow Control Baud Rate Divider Latch, in
Set5.Reg1~0) to be loaded into advanced baud rate divisor latch (ADBLL/ADBHL, in
Set2.Reg1~0).
EN_FC - Enable Flow Control
A write to 1 enables flow control function and bit 7~1 of this register.
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Publication Release Date: March 1998
Revision 0.58