W83877ATF Datasheet, PDF (69/191 Pages) Winbond – enhanced version from Winbonds most popular I/O chip W83877F

W83877ATF
Bit 7~4: Reserved, write to 0.
Bit 3, 2: IR_MSL1, 0 - Infrared mode Select
Select legacy UART or SIR or ASK-IR mode. Note that using legacy SIR/ASK-IR should set
DIS_BACK=1 to avoid backward operation when programming baud rate. Mode selected is
shown below. Note that to avoid legacy backward operation, the bit of DIS_BACK (Disable
Backward, in Set2.Reg4. Bit7) should be set to 1 when legacy ASK-IR mode or legacy SIR
mode is selected.
IR_MSL1, 0
00
01
10
11
Operation Mode Selected
Legacy UART
Reserved
Legacy ASK-IR
Legacy SIR
Bit 1:
Bit 0:
TMR_TST - Timer Test
Write to 1 will cause reading the TMRL/TMRH will return the programmed values of
TMRL/TMRH, that is, it does not return down count counter value. This bit is for test timer
register.
EN_TMR - Enable Timer
Write to 1 enables the timer.
4.3.6.3 Set4.Reg3 - Set Select Register (SSR)
Reading this register returns E8₁₆. A write to this register selects other Set.
Reg.
SSR
default Value
Bit 7
SSR7
1
Bit 6
SSR6
1
Bit 5
SSR5
1
Bit 4
SSR4
1
Bit 3
SSR3
1
Bit 2
SSR2
0
Bit 1
SRR1
0
Bit 0
SRR0
0
4.3.6.4 Set4.Reg4, 5 - Transmitter Frame Length (TFRLL/TFRLH)
Reg.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
TFRLL
Reset Value
TFRLH
Reset Value
bit 7
0
-
-
bit 6
0
-
-
bit 5
bit 4
bit3
bit 2
0
0
0
0
-
bit 12
bit 11
bit 10
-
0
0
0
Bit 1
bit 1
0
bit 9
0
Bit 0
bit 0
0
bit 8
0
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Publication Release Date: April 1998
Version 0.51