430
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
f
X
f
CPU
SCK1
SO1
SI1
T
CPU
T
SCK
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
Interval
(a) When the automatic transmit/receive function is used by the internal clock
If bit 1 (CSIM11) of serial operation mode register 1 (CSIM1) is set at (1), the internal clock operates.
If the auto send and receive function is operated by the internal clock, interval timing by CPU processing
is as follows.
When bit 7 (ADTI7) of automatic data transmit/receive interval specify register (ADTI) is set to 0, the
interval depends on the CPU processing. When ADTI7 is set to 1, it depends on the contents of the ADTI
or CPU processing, whichever is greater.
Refer to Figure 18-5 Automatic Data Transmit/Receive Interval Specify Register Format for the
intervals which are set by the ADTI.
Table 18-2. Interval Timing Through CPU Processing (When the Internal Clock Is Operating)
CPU Processing
Interval Time
When using multiplication instruction
Max. (2.5T
SCK
, 13T
CPU
)
When using division instruction
Max. (2.5T
SCK
, 20T
CPU
)
External access 1 wait mode
Max. (2.5T
SCK
, 9T
CPU
)
Other than above
Max. (2.5T
SCK
, 7T
CPU
)
T
SCK
: 1/f
SCK
f
SCK
: Serial clock frequency
T
CPU
: 1/f
CPU
f
CPU
: CPU clock (set by bits 0 to 2 (PCC0 to PCC2) of the processor clock control register (PCC)
and bit 0 (MCS) of the oscillation mode selection register (OSMS))
MAX. (a, b): a or b, whichever is greater
Figure 18-24. Operation Timing with Automatic Data Transmit/Receive Function Performed by
Internal Clock
f
X
: Main system clock oscillation frequency
f
CPU
: CPU clock (set by bit 0 to bit 2 (PCC0 to PCC2) of the processor clock control register (PCC)
and bit 0 (MCS) of the oscillation mode select register (OSMS).
T
CPU
: 1/f
CPU
T
SCK
: 1/f
SCK
f
SCK
: Serial clock frequency
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