h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 673

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

18B.3.5 Host Interface Serialized Interrupt Operation (SERIRQ)
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 supporting function, and a request
signal is generated by the frame corresponding to that interrupt. The timing is shown in figure
18B.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
H = Host control, SL = Slave control, R = Recovery, T = Turnaround, S = Sample
LCLK
SERIRQ
Driver
H = Host control, R = Recovery, T = Turnaround, S = Sample, I = Idle
IRQ14 frame
S
IRQ1
None
SL
or
H
R
T
START
Host controller
Start frame
H
IRQ15 frame
S
IRQ15
Figure 18B.6 SERIRQ Timing
R
R
T
IOCHCK frame
T
S
None
IRQ0 frame
S
R
None
Section 18B Host Interface LPC Interface (LPC)
R
T
Rev. 3.00 Jan 18, 2006 page 645 of 1044
T
I
S
IRQ1 frame
IRQ1
Host controller
Stop frame
STOP
H
R
T
R
S
IRQ2 frame
T
None
REJ09B0280-0300
R
Next cycle
T
START