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CHAPTER 17 SERIAL INTERFACE CHANNEL 1
444
CPU Processing
Interval
When using multiply instruction
MAX. (2.5 T
SCK
, 26 T
CPU
)
When using divide instruction
MAX. (2.5 T
SCK
, 40 T
CPU
)
External access 1 wait mode
MAX. (2.5 T
SCK
, 18 T
CPU
)
Other than above
MAX. (2.5 T
SCK
, 14 T
CPU
)
(a) In case the automatic data transmit/receive function is performed by an internal clock
When bit 1 (CSIM11) of the serial operation mode register 1 (CSIM1) is set to 1, the internal clock performs.
In this case, the interval is determined as follows by CPU processing.
Table 17-2. Interval by CPU Processing (in Internal Clock Operation)
T
SCK
: 1/f
SCK
f
SCK
: Serial clock frequency
T
CPU
: 1/f
CPU
f
CPU
: CPU clock (set by bit 0 to bit 2 (PCC0 to PCC2) of processor clock control
register)
MAX. (a, b) : a or b, whichever greater
Figure 17-23. Operating Timing in Operating Automatic Transmission/Reception
with Internal Clock
SCK1
SO1
SI1
f
CPU
(n = 1)
T
CPU
Interval
T
SCK
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
f
CPU
: CPU clock (set by bit 0 to bit 2 (PCC0 to PCC2) of processor clock control register (PCC))
T
CPU
: 1/f
CPU
T
SCK
: 1/f
SCK
f
SCK
: Serial clock frequency
Summary of Contents for 78014Y Series
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