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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).