Datasheet

Section 19 Host Interface LPC Interface (LPC)
Rev. 3.00 Mar 21, 2006 page 573 of 788
REJ09B0300-0300
Serial Interrupt Transfer Cycle
Frame
Count
Contents
Drive
Source
Number
of States
Notes
0Start Slave
Host
6 In quiet mode only, slave drive possible in first
state, then next 3 states 0-driven by host
1IRQ0 Slave3
2 IRQ1 Slave 3 Drive possible in LPC channel 1
3 SMI Slave 3 Drive possible in LPC channels 2 and 3
4IRQ3 Slave3
5IRQ4 Slave3
6IRQ5 Slave3
7 IRQ6 Slave 3 Drive possible in LPC channels 2 and 3
8IRQ7 Slave3
9IRQ8 Slave3
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