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4.5 EMIF Interrupt Mask Register (EIMR)
Similar to the EMIF interrupt raw register (EIRR), the EMIF interrupt mask register (EIMR) is used to
monitor and clear the status of the EMIF’s hardware-generated interrupts. The main difference between
the two registers is that when the bits in EIMR are set, an active-high pulse is sent to the CPU interrupt
controller. Also, the bits in EIMR are only set to 1, if the associated interrupt has been enabled in the
EMIF interrupt mask set register (EIMSR). The EIMR is shown in Figure 24 and described in Table 37.
Figure 24. EMIF Interrupt Mask Register (EIMR)
31 16
Reserved
R-0
15 8
Reserved
R-0
7 6 5 4 3 2 1 0
Reserved WRM3 WRM2 WRM1 WRM0 Reserved ATM
R-0 R/W1C-0 R/W1C-0 R/W1C-0 R/W1C-0 R-0 R/W1C-0
LEGEND: R/W = Read/Write; R = Read only; W1C = Write 1 to clear (writing 0 has no effect); -n = value after reset
Table 37. EMIF Interrupt Mask Register (EIMR) Field Descriptions
Bit Field Value Description
31-6 Reserved 0 Reserved. The reserved bit location is always read as 0. If writing to this field, always write the default
value of 0.
5 WRM3 Wait Rise Masked. This bit is set to 1 by hardware to indicate a rising edge has occurred on the
EM_WAIT[5] pin, provided that the WRMSET3 bit is set to 1 in the EMIF interrupt mask set register
(EIMSR).
0 Indicates that a wait rise interrupt has not been generated. Writing a 0 has no effect.
1 Indicates that a wait rise interrupt has been generated. Writing a 1 will clear this bit and the WRM3 bit in
the EMIF interrupt raw register (EIRR).
4 WRM2 Wait Rise Masked. This bit is set to 1 by hardware to indicate a rising edge has occurred on the
EM_WAIT[4] pin, provided that the WRMSET2 bit is set to 1 in the EMIF interrupt mask set register
(EIMSR).
0 Indicates that a wait rise interrupt has not been generated. Writing a 0 has no effect.
1 Indicates that a wait rise interrupt has been generated. Writing a 1 will clear this bit and the WRM2 bit in
the EMIF interrupt raw register (EIRR).
3 WRM1 Wait Rise Masked. This bit is set to 1 by hardware to indicate a rising edge has occurred on the
EM_WAIT[3] pin, provided that the WRMSET1 bit is set to 1 in the EMIF interrupt mask set register
(EIMSR).
0 Indicates that a wait rise interrupt has not been generated. Writing a 0 has no effect.
1 Indicates that a wait rise interrupt has been generated. Writing a 1 will clear this bit and the WRM1 bit in
the EMIF interrupt raw register (EIRR).
2 WRM0 Wait Rise Masked. This bit is set to 1 by hardware to indicate a rising edge has occurred on the
EM_WAIT[2] pin, provided that the WRMSET0 bit is set to 1 in the EMIF interrupt mask set register
(EIMSR).
0 Indicates that a wait rise interrupt has not been generated. Writing a 0 has no effect.
1 Indicates that a wait rise interrupt has been generated. Writing a 1 will clear this bit and the WRM0 bit in
the EMIF interrupt raw register (EIRR).
1 Reserved 0 Reserved. The reserved bit location is always read as 0. If writing to this field, always write the default
value of 0.
54
Asynchronous External Memory Interface (EMIF) SPRUEQ7C–February 2010
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