TC1796
System Units (Vol. 1 of 2)
Interrupt System
User’s Manual 14-4 V2.0, 2007-07
Interrupt, V2.0
14.2.1.1 General Service Request Control Register Layout
mod_SRC
Service Request Control Register (00
H
) Reset Value: 0000 0000
H
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0
r
1514131211109876543210
SET
R
CLR
R
SRR SRE 0 TOS 0 SRPN
w w rh rw r rw r rw
Field Bits Type Description
SRPN [7:0] rw Service Request Priority Number
00
H
Service request is never serviced
01
H
Service request is on lowest priority
…
H
…
FF
H
Service request is on highest priority
TOS 10 rw Type of Service Control
0
B
CPU service is initiated
1
B
PCP request is initiated
SRE 12 rw Service Request Enable
0
B
Service request is disabled
1
B
Service request is enabled
SRR 13 rh Service Request Flag
0
B
No service request is pending
1
B
A service request is pending
CLRR 14 w Request Clear Bit
CLRR is required to clear SRR.
0
B
No action
1
B
Clear SRR; bit value is not stored; read always
returns 0; no action if SETR is set also.
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