SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 129

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

Revision 3.0
SuperI/O Module
These two registers (IRWTR1L and IRWTR1H) define the low and high limits of time range 1 (see Table 4-26 on page 125). The values
are represented in units of 0.1 msec.
• RC-5 protocol: The pulse width defining a half-bit cell must fall within this range in order for the cell to be considered valid. The
• NEC protocol: The time between two consecutive CEIR pulses that encodes a bit value of 1 must fall within this range. The nominal
Bank 1, Offset 0Ah
This register is set to 07h on power-up of V
Bank 1, Offset 0Bh
This register is set to 0Bh on power-up of V
These two registers (IRWTR2L and IRWTR2H) define the low and high limits of time range 2 (see Table 4-26 on page 125). The values
are represented in units of 0.1 msec.
• RC-5 protocol: These registers are not used when the RC-5 protocol is selected.
• NEC protocol: The header pulse width must fall within this range in order for the header to be considered valid. The nominal value is
Bank 1, Offset 0Ch
This register is set to 50h on power-up of V
Bank 1, Offset 0Dh
This register is set to 64h on power-up of V
These two registers (IRWTR3L and IRWTR3H) define the low and high limits of time range 3 (see Table 4-26 on page 125). The values
are represented in units of 0.1 msec.
• RC-5 protocol: These registers are not used when the RC-5 protocol is selected.
•
Bank 1, Offset 0Eh
This register is set to 28h on power-up of V
Bank 1, Offset 0Fh
This register is set to 32h on power-up of V
nominal pulse width is 0.889 for a 38 KHz carrier. IRWTR1L and IRWTR1H should be set to 07h and 0Bh, respectively. (Default)
time for a 1 is 2.25 msec for a 36 KHz carrier. IRWTR1L and IRWTR1H should be set to 14h and 19h, respectively.
9 msec for a 38 KHz carrier. IRWTR2L and IRWTR2H should be set to 50h and 64h, respectively. (Default)
NEC protocol: The post header gap width must fall within this range in order for the gap to be considered valid. The nominal value is
4.5 msec for a 36 KHz carrier. IRWTR3L and IRWTR3H should be set to 28h and 32h, respectively. (Default)
7:5
4:0
7:5
4:0
7:0
7:0
7:0
7:0
Bit
Table 4-30. Bank 1 - CEIR Wakeup Configuration and Control Registers (Continued)
Description
Reserved.
CEIR Pulse Change, Range 1, Low Limit.
Reserved.
CEIR Pulse Change, Range 1, High Limit.
CEIR Pulse Change, Range 2, Low Limit.
CEIR Pulse Change, Range 2, High Limit.
CEIR Pulse Change, Range 3, Low Limit.
CEIR Pulse Change, Range 3, High Limit.
(Continued)
PP
PP
PP
PP
PP
PP
or software reset.
or software reset.
or software reset.
or software reset.
or software reset.
or software reset.
CEIR Wakeup Range 1 Registers
CEIR Wakeup Range 2 Registers
CEIR Wakeup Range 3 Registers
IRWTR1H Register (R/W)
IRWTR2H Register (R/W)
IRWTR3H Register (R/W)
IRWTR1L Register (R/W)
IRWTR2L Register (R/W)
IRWTR3L Register (R/W)
129
Reset Value: 0Bh
Reset Value: 07h
Reset Value: 50h
Reset Value: 64h
Reset Value: 28h
Reset Value: 32h
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