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CHAPTER 14 SERIAL INTERFACE (SIO1)
Preliminary User’s Manual U13420EJ2V0UM00
Figure 14-19. Busy Signal and Wait Release (when BUSY00 = 0)
(b) Strobe control option
Strobe control is a function for synchronizing data transmission/reception between the master and slave
devices. The master device outputs the strobe signal from the STB/P80 pin when 8-bit transmission/
reception has been completed. By this signal, the slave device can determine the timing of the end of
data transmission. Therefore, synchronization is established even if a bit shift occurs because noise is
superimposed on the serial clock, and transmission of the next byte is not affected by the bit shift.
To use the strobe control option, the following conditions must be satisfied:
• Bit 5 (ATE0) of the serial operating mode register 1 (CSIM1) is set to 1.
• Bit 2 (STRB0) of the automatic data transmit/receive control register (ADTC0) is set to 1.
A strobe signal is output from the STB/P80 pin for the duration of 1 clock in synchronization with the falling
of the ninth serial clock.
Figure 14-20 shows the operation timing when the strobe control option is used.
Figure 14-20. Operation Timing When Strobe Control Option Is Used
SCK1
D7
SO1
SI1
D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
BUSY
(active high)
1.5 clock (min.)
Busy input released
Busy input valid
Wait
If made inactive
immediately after
sampled
D7
D6
D5
D4
D3
D2
D1 D0
D0
D7
D6
D5
D4
D3
D2
D1
D7
D6
D5
D4
D3
D2
D1 D0
D0
D7
D6
D5
D4
D3
D2
D1
Strobe signal output
Strobe signal output
SCK1
SO1
SI1
STB
CSIIF1
Содержание mPD780065 Series
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