Section 19 LPC Interface (LPC)
Rev. 1.00 Mar. 12, 2008 Page 734 of 1178
REJ09B0403-0100
An LPC transfer cycle is started when the
LFRAME
signal goes low in the bus idle state. If the
LFRAME
signal goes low when the bus is not idle, this means that a forced termination (abort) of
the LPC transfer cycle has been requested.
In an I/O read cycle or I/O write cycle, transfer is carried out using LAD3 to LAD0 in the
following order, in synchronization with LCLK. The host can be made to wait by sending back a
value other than B'0000 in the slave's synchronization return cycle, but the LPC interface of this
LSI always returns B'0000 (except for the BT interface).
If the received address matches the host address for an LPC register, the LPC interface enters the
busy state; it returns to the idle state by output of a state count 12 turnaround. Register and flag
changes are made at this timing, so in the event of a transfer cycle forced termination (abort),
registers and flags are not changed.
The timing of the
LFRAME
, LCLK, and LAD signals is shown in figures 19.2 and 19.3.
Table 19.5 LPC I/O Cycle
I/O Read Cycle
I/O Write Cycle
State
Count
Contents
Drive
Source
Value
(3 to 0)
Contents
Drive
Source
Value
(3 to 0)
1
Start Host
0000
Start Host
0000
2
Cycle type/direction
Host
0000
Cycle type/direction
Host
0010
3
Address 1
Host
Bits 15 to 12 Address 1
Host
Bits 15 to 12
4
Address 2
Host
Bits 11 to 8
Address 2
Host
Bits 11 to 8
5
Address 3
Host
Bits 7 to 4
Address 3
Host
Bits 7 to 4
6
Address 4
Host
Bits 3 to 0
Address 4
Host
Bits 3 to 0
7
Turnaround (recovery) Host
1111
Data 1
Host
Bits 3 to 0
8
Turnaround
None
ZZZZ
Data 2
Host
Bits 7 to 4
9 Synchronization Slave
0000
Turnaround
(recovery)
Host
1111
10
Data 1
Slave
Bits 3 to 0
Turnaround
None
ZZZZ
11
Data 2
Slave
Bits 7 to 4
Synchronization
Slave
0000
12
Turnaround (recovery) Slave
1111
Turnaround (recovery) Slave
1111
13
Turnaround None
ZZZZ
Turnaround None
ZZZZ
Содержание H8S Family
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Страница 632: ...Section 17 Synchronous Serial Communication Unit SSU Rev 1 00 Mar 12 2008 Page 584 of 1178 REJ09B0403 0100...
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