UPD17073 NEC, UPD17073 Datasheet - Page 145

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

16.2 IF Counter Input Select Block and Gate Time Control Block
AMIFC and P0D2/AMFIC pin are used as IF counter function pins or general-purpose I/O port pins.
mode. These pins can be set in the input or output mode by using the port 0C bit I/O select register at address 6FH
of BANK1 of RAM. For the configuration and function of the port 0C bit I/O select register, refer to 10.2.3 (2) Port
0C bit I/O select register.
select register.
P0D3/FMIFC/AMIFC
Figure 16-2 shows the configuration of the IF counter input select block and gate time control block.
The IF counter input select block selects, by using the IF counter mode select register, whether the P0D3/FMIFC/
When using the IF counter function, be sure to set the P0D3/FMIFC/AMIFC and P0D2/AMIFC pins in the input
The gate time control block sets the gate time when the IF counter function is used, by using the IF counter mode
Figure 16-3 shows the configuration and function of the IF counter mode register.
Figure 16-2. Configuration of IF Counter Input Select Block and Gate Time Control Block
P0D2/AMIFC
Input port
IFCMD1 flag
IFCMD0 flag
Pin select
Gate signal generator
IFCCK1 flag
IFCCK0 flag
Operation mode select
FMIFC mode
AMIFC mode
1/2
PD17072,17073
To start
control block
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