Siuie_2 (0X0C00 0001: Lcr7 = 0) - NEC VR4181 mPD30181 User Manual

20.3.4 SIUIE_2 (0x0C00 0001: LCR7 = 0)

Bit 7
Name Reserved
R/W R
RTCRST 0
Other resets 0
Bit Name
7 to 4 Reserved
3 IE3
2 IE2
1 IE1
0 IE0
This register is used to specify interrupt enable/prohibit settings for the five types of interrupt requests used in the
SIU2.
An interrupt is enabled by setting the corresponding bit to 1.
Overall use of interrupt functions can be halted by setting bits 0 to 3 of this register to 0.
When interrupts are prohibited, "pending" is not displayed in the IIR0 bit in the SIUIID_2 register even when
interrupt conditions have been met.
Other functions in the SIU2 are not affected even though interrupts are prohibited and the settings in the SIULS_2
register and SIUMS_2 register are valid.
To access this register, set the LCR7 bit (bit 7 of the SIULC_2 register) to 0.
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CHAPTER 20 SERIAL INTERFACE UNIT 2 (SIU2)
6 5
Reserved Reserved Reserved
R R
0 0
0 0
0 is returned when read
Modem status interrupt
1 : Enable
0 : Prohibit
Receive status interrupt
1 : Enable
0 : Prohibit
Transmit holding register empty interrupt
1 : Enable
0 : Prohibit
Receive data ready interrupt or character timeout interrupt in FIFO mode
1 : Enable
0 : Prohibit
User's Manual U14272EJ3V0UM
4 3 2
IE3 IE2
R R/W R/W
0 0 0
0 0 0
Function
1 0
IE1 IE0
R/W R/W
0 0
0 0