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UPD6708 데이터시트(PDF) 28 Page - Renesas Technology Corp

부품명 UPD6708
상세설명  MOS INTEGRATED CIRCUIT
PDF  74 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD6708 데이터시트(HTML) 28 Page - Renesas Technology Corp

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26
µPD6708
4.2.2
Switching through software control
With the C/D pin at the high level and the R/W pin at the low level, the host interface mode can be switched from the
host controller by setting bits 5 and 4 of CMR to the values shown in Table 4-5.
Table 4-5. Switching Host Interface Mode by Software Control
Bit 5
Bit 4
Host Interface Mode
0
0
Mode switching by pin control
0
1
Data write mode
1
0
Data read mode
1
1
Status read mode
After one byte of data has been forwarded, the host interface mode will become the command write mode, which is
controlled by the C/D and R/W pins.
Figure 4-3. Example of Host Controller Connections by Software Control
IEBus
120
Ω
120
Ω
5 V
12 MHz
5 V
Power Supply
Voltage Detection
Circuit
PD6708
µ
VDD
AVDD
BUS+
BUS–
XI
XO
GND
TEST
SCK
SI
SO
IRQ
C/D
R/W
CS
RESET
SCK
SO
SI
INT
Host Controller
5 V



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