h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 439
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h8s-2111b
Manufacturer Part Number
h8s-2111b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2111B.pdf
(582 pages)
- Current page: 439 of 582
- Download datasheet (4Mb)
15.4.5
A host interrupt request can be issued from the host interface by means of the SERIRQ pin. In a
host interrupt request via the SERIRQ pin, LCLK cycles are counted from the start frame of the
serialized interrupt transfer cycle generated by the host or a peripheral function, and a request
signal is generated by the frame corresponding to that interrupt. The timing is shown in figure
15.6.
The serialized interrupt transfer cycle frame configuration is as follows. Two of the states
comprising each frame are the recover state in which the SERIRQ signal is returned to the 1-level
at the end of the frame, and the turnaround state in which the SERIRQ signal is not driven. The
recover state must be driven by the host or slave processor that was driving the preceding state.
LCLK
SERIRQ
Drive source
[Legend]
H = Host control, SL = Slave control, R = Recovery, T = Turnaround, S = Sample
LCLK
SERIRQ
Driver
[Legend]
H = Host control, R = Recovery, T = Turnaround, S = Sample, I = Idle
Host Interface Serialized Interrupt Operation (SERIRQ)
S
IRQ14 frame
IRQ1
None
SL
or
H
R
T
START
Host controller
Start frame
H
S
IRQ15 frame
IRQ15
Figure 15.6 SERIRQ Timing
R
R
T
T
IOCHCK frame
S
None
S
R
IRQ0 frame
None
R
T
T
I
S
IRQ1 frame
IRQ1
Rev. 1.00, 05/04, page 405 of 544
Stop frame
Host controller
STOP
H
R
T
R
S
T
IRQ2 frame
None
R
Next cycle
T
START
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