w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 88

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

4.6.1 Set4.Reg0, 1 - Timer Value Register (TMRL/TMRH)
This is a 12-bit timer whose resolution is 1ms, that is, the maximum programmable time is 2
The timer is a down-counter and starts counting down when EN_TMR (Enable Timer) of Set4.Reg2 is
set to 1. When the timer counts down to zero and EN_TMR=1, the TMR_I is set to 1 and a new initial
value will be loaded into counter.
4.6.2 Set4.Reg2 - Infrared Mode Select (IR_MSL)
Bit 7~4: Reserved, write to 0.
Bit 3, 2: IR_MSL1, 0 - Infrared Mode Select
Bit 1:
Bit 0:
4.6.3 Set4.Reg3 - Set Select Register (SSR)
Reading this register returns E8H. Writing this register selects Register Set.
Advanced IR
Default Value
Reset Value
Mode
Reg.
SSR
Select legacy IR, SIR, or ASK-IR mode. Note that in legacy SIR/ASK-IR user should set
DIS_BACK=1 to avoid backward when programming baud rate.
TMR_TST - Timer Test
When set to 1, reading the TMRL/TMRH returns the programmed values of TMRL/TMRH
instead of the value of down counter. This bit is for testing timer register.
EN_TMR - Enable Timer
A write to 1 will enable the timer.
Bit 7
SSR7
Bit 7
0
-
1
IR_MSL1, 0
Bit 6
00
01
10
11
0
-
SSR6
Bit 6
1
Bit 5
0
-
SSR5
Bit 5
Bit 4
1
0
-
IR_MSL1
SSR4
Bit 4
Bit 3
- 69 -
Operation Mode Selected
1
0
Legacy ASK-IR
Legacy SIR
Legacy IR
SSR3
Bit 3
IR_MSL0
1
CIR
Bit 2
0
Publication Release Date:April 1998
SSR2
Bit 2
0
TMR_TST
W83977ATF
Bit 1
0
PRELIMINARY
SRR1
Bit 1
0
Revision 0.52
EN_TMR
Bit 0
12
SRR0
Bit 0
0
-1 ms.
0