h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 626

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 19 Host Interface LPC Interface (LPC)
19.4.5
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
19.6.
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.
Rev. 3.00 Mar 21, 2006 page 572 of 788
REJ09B0300-0300
LCLK
SERIRQ
Drive source
LCLK
SERIRQ
Driver
Legend:
H:
SL: Slave control
R:
Host control
Recovery
Host Interface Serialized Interrupt Operation (SERIRQ)
IRQ14 frame
S
IRQ1
None
SL
or
H
R
T:
S:
I:
T
START
Host controller
Turnaround
Sample
Idle
Start frame
H
IRQ15 frame
S
IRQ15
Figure 19.6 SERIRQ Timing
R
R
T
IOCHCK frame
T
S
None
IRQ0 frame
S
R
None
R
T
T
I
S
IRQ1 frame
IRQ1
Host controller
Stop frame
STOP
H
R
T
R
S
IRQ2 frame
T
None
R
Next cycle
T
START