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Renesas H8S/2111B User Manual

Page 440

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Rev. 1.00, 05/04, page 406 of 544

Serial Interrupt Transfer Cycle

Frame
Count Contents

Drive
Source

Number
of States

Notes

0 Start Slave

Host

6

In quiet mode only, slave drive possible in first
state, then next 3 states 0-driven by host

1 IRQ0 Slave

3

2

IRQ1

Slave

3

Drive possible in LPC channel 1

3

SMI

Slave

3

Drive possible in LPC channels 2 and 3

4 IRQ3 Slave

3

5 IRQ4 Slave

3

6 IRQ5 Slave

3

7

IRQ6

Slave

3

Drive possible in LPC channels 2 and 3

8 IRQ7 Slave

3

9 IRQ8 Slave

3

10

IRQ9

Slave

3

Drive possible in LPC channels 2 and 3

11

IRQ10

Slave

3

Drive possible in LPC channels 2 and 3

12

IRQ11

Slave

3

Drive possible in LPC channels 2 and 3

13

IRQ12

Slave

3

Drive possible in LPC channel 1

14 IRQ13 Slave

3

15 IRQ14 Slave

3

16 IRQ15 Slave

3

17 IOCHCK

Slave

3

18

Stop

Host

Undefined

First, 1 or more idle states, then 2 or 3 states
0-driven by host
2 states: Quiet mode next
3 states: Continuous mode next

There are two modes—continuous mode and quiet mode—for serialized interrupts. The mode
initiated in the next transfer cycle is selected by the stop frame of the serialized interrupt transfer
cycle that ended before that cycle.

In continuous mode, the host initiates host interrupt transfer cycles at regular intervals. In quiet
mode, the slave processor with interrupt sources requiring a request can also initiate an interrupt
transfer cycle, in addition to the host. In quiet mode, since the host does not necessarily initiate
interrupt transfer cycles, it is possible to suspend the clock (LCLK) supply and enter the power-
down state. In order for a slave to transfer an interrupt request in this case, a request to restart the
clock must first be issued to the host. For details see section 15.4.6, Host Interface Clock Start
Request (CLKRUN).

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