UPD17073 NEC, UPD17073 Datasheet - Page 113

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

14.2 Clock Input/Output Control Block and Data Input/Output Control Block
interface (2-wire or 3-wire mode), control the transmit/receive operation, and select a shift clock.
register.
input/output setting flag of each pin must be also manipulated in addition to the control flag of the serial interface, to
set each pin.
(SO1) pin.
reset
At
Serial I/O
clock select
register
The clock input/output control block and data input/output control block select the operation mode of the serial
The flags that control these blocks are allocated to the serial I/O clock select register and serial I/O mode select
Figure 14-2 shows the configuration and function of the serial I/O clock select register.
Figure 14-3 shows the configuration and function of the serial I/O mode select register.
Table 14-1 shows the setting status of each pin by the corresponding control flags. As shown in this table, the
The SIOCK1 and 0 flags select the internal clock (master) or external clock (slave) operation.
The SIOHIZ flag selects whether the SO0/P1C0 pin is used as a serial data output pin.
The SIOSEL flag selects whether the SO1/SI/P0B3 pin is used as a serial data input (SI pin) or serial data output
Power-ON
Clock stop
CE
Name
Figure 14-2. Configuration of Serial I/O Clock Select Register
b
0
0
3
Flag symbol
b
0
0
2
b
O
C
K
S
1
0
0
1
1
I
0
0
0
1
b
O
K
S
C
0
1
0
1
0
0
0
0
I
0
External clock
12.5 kHz
18.75 kHz
37.5 kHz
Fixed to “0”
(BANK1)
Address
61H
Read/
Write
R/W
Sets shift clock of serial interface
Internal clock
PD17072,17073
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