UPD17073 NEC, UPD17073 Datasheet - Page 124

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

Item
Status of
each pin
Program counter
Operation of
presettable
shift register
124
Operation mode
SCK/P0B2
SI/SO1/P0B3
SO0/P1C0
Output
Input
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –
• When P0BBIO2 = 0
• When P0BBIO2 = 1
• When P0BBIO3 = 0
• When P0BBIO3 = 1
Waits for serial output
regardless of P0BBIO3
Incremented at falling edge of SCK pin
• When SIOSEL = 1
• When SIOSEL = 0
General-purpose input port
General-purpose output
port
General-purpose input port
General-purpose output
port
Shifted from MSB and output from SIO1 pin at falling edge of SCK pin
Shifted from LSB and status of SI pin is input at rising edge of SCK pin.
If SI pin is set in output port mode, however, contents of output latch are input.
During wait (SIOTS = 0)
Slave operation (SIOCK1 = SIOCK0 = 0)
Table 14-4. Operation in Two-Wire Serial I/O Mode
• When P0BBIO2 = 0
• When P0BBIO2 = 1
• When P0BBIO3 = 0
• When P0BBIO3 = 1
Serial output regardless of
P0BBIO3
Wait released (SIOTS = 1)
External clock input port
General-purpose output
port
Serial input
General-purpose output
port
General-purpose output port
SIOSEL = 0
SIOSEL = 0
SIOHIZ = 1
• When P0BBIO2 = 0
• When P0BBIO2 = 1
• When P0BBIO3 = 0
• When P0BBIO3 = 1
Waits for serial output
regardless of P0BBIO3
General-purpose input port
Waits for internal clock
output
General-purpose input port
General-purpose output
port
During wait (SIOTS = 0)
Master operation (SIOCK1 = SIOCK0 = other than 0)
• When P0BBIO2 = 0
• When P0BBIO2 = 1
• When P0BBIO3 = 0
• When P0BBIO3 = 1
Serial output regardless of
P0BBIO3
Wait released (SIOTS = 1)
General-purpose input port
Internal clock output
Serial input
General-purpose output
port
PD17072,17073