h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 440

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

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).
Rev. 1.00, 05/04, page 406 of 544
Frame
Count
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Contents
Start
IRQ0
IRQ1
SMI
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
IOCHCK
Stop
Serial Interrupt Transfer Cycle
Drive
Source
Slave
Host
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Host
Number
of States
6
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
Undefined
Notes
In quiet mode only, slave drive possible in first
state, then next 3 states 0-driven by host
Drive possible in LPC channel 1
Drive possible in LPC channels 2 and 3
Drive possible in LPC channels 2 and 3
Drive possible in LPC channels 2 and 3
Drive possible in LPC channels 2 and 3
Drive possible in LPC channels 2 and 3
Drive possible in LPC channel 1
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