參數(shù)資料
型號(hào): TMP86PS27FG
廠商: Toshiba Corporation
英文描述: Zener Diode; Application: General; Pd (mW): 500; Vz (V): 6.6 to 6.9; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35
中文描述: 8位微控制器
文件頁(yè)數(shù): 148/206頁(yè)
文件大?。?/td> 1415K
代理商: TMP86PS27FG
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Page 138
12. Synchronous Serial Interface (SIO)
12.3 Serial clock
TMP86PS27FG
Note 2: Set MULSEL register before performing the setting terminal of a I/O port when changing a terminal.
12.3 Serial clock
12.3.1 Clock source
Internal clock or external clock for the source clock is selected by SIOCR1<SCK>.
12.3.1.1 Internal clock
Any of six frequencies can be selected. The serial clock is output to the outside on the SCK pin. The
SCK pin goes high when transfer starts.
When data writing (in the transmit mode) or reading (in the receive mode or the transmit/receive mode)
cannot keep up with the serial clock rate, there is a wait function that automatically stops the serial clock
and holds the next shift operation until the read/write processing is completed.
Note: 1 Kbit = 1024 bit (fc = 16 MHz, fs = 32.768 kHz)
Figure 12-3 Automatic Wait Function (at 4-bit transmit mode)
12.3.1.2 External clock
An external clock connected to the
SCK
pin is used as the serial clock. In this case, output latch of this
port should be set to "1". To ensure shifting, a pulse width of at least 4 machine cycles is required. This
pulse is needed for the shift operation to execute certainly. Actually, there is necessary processing time for
interrupting, writing, and reading. The minimum pulse is determined by setting the mode and the pro-
gram. Therfore, maximum transfer frequency will be 488.3K bit/sec (at fc=16MHz).
Table 12-1 Serial Clock Rate
NORMAL1/2, IDLE1/2 mode
SLOW1/2,
SLEEP1/2 mode
DV7CK = 0
DV7CK = 1
SCK
Clock
Baud Rate
Clock
Baud Rate
Clock
Baud Rate
000
fc/2
13
1.91 Kbps
fs/2
5
1024 bps
fs/2
5
1024 bps
001
fc/2
8
61.04 Kbps
fc/2
8
61.04 Kbps
-
-
010
fc/2
7
122.07 Kbps
fc/2
7
122.07 Kbps
-
-
011
fc/2
6
244.14 Kbps
fc/2
6
244.14 Kbps
-
-
100
fc/2
5
488.28 Kbps
fc/2
5
488.28 Kbps
-
-
101
fc/2
4
976.56 Kbps
fc/2
4
976.56 Kbps
-
-
110
-
-
-
-
-
-
111
External
External
External
External
External
External
a
1
a
2
b
0
b
1
b
2
b
3
c
0
c
1
a
3
a
c
b
a
0
pin (output)
pin (output)
Written transmit
data
Automatically
wait function
SCK
SO
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