
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-54 -
Revision A1
4.0 INFRARED (IR) PORTS
4.1 IR PORT
The Infrared (IR) function provides point-to-point (or multi-point to multi-point) wireless
communication which can operate under various transmission protocols including IrDA 1.0 SIR,
SHARP ASK-IR. IR port shares the same port with UART B port in W83977EF/CTF. Please refer to
section 11.5 for configuration information.
4.2 CIR PORT(For W83977CTF only)
The CIR port of the W83977CTF is an independent device, and supports an T-period mode, Over-
sampling mode and Over-sampling mode with re-sync for demodulation of cir signal. Refer to the
configuration registers for more information on disabling, address selecting and IRQ selectiing .The
function of each CIR register is described below.
4.2.1 Bank0.Reg0 - Receiver Buffer Registers (RBR) (Read)
Receiver Buffer Register is read only. When the CIR pulse train has been detected and passed by the
internal signal filter, the data samped and shifted into shifter register will write into Receiver Buffer
Register. In the CIR, this port only supports PIO mode and the address port is defined in the PnP.
4.2.2 Bank0.Reg1 - Interrupt Control Register (ICR)
Power on default <7:0> = 00000000 binary
Bit
Name
Read/Write
Description
7
EN_GLBI
Read/Write
Enable Global Interrupt. Write 1, enable interrupt. Write
0, disable global interrupt.
6-3
Reserved
-
Reserved
2
EN_TMR_I
Read/Write
Enable Timer Interrupt.
1
En_LSR_I
Read/Write
Enable Line-Status-Register interrupt.
0
EN_RX_I
Read/Write
Receiver Thershold-Level Interrupt Enable.