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User’s Manual U15104EJ2V0UD
CHAPTER 14 FREQUENCY COUNTER
14.1 Function of Frequency Counter
The frequency counter counts the intermediate frequency (IF) of a tuner.
The intermediate frequency input to the FMIFC or AMIFC pin is counted for a specific time (1 ms, 4 ms, 8 ms, or
open) by a 16-bit counter. The count value of the frequency counter is stored in the IF counter register.
For the range of the frequency that can be input to the FMIFC and AMIFC pins, refer to CHAPTER 19 ELECTRICAL
SPECIFICATIONS.
14.2 Configuration of Frequency Counter
The frequency counter consists of the following hardware.
Table 14-1. Configuration of Frequency Counter
Item
Configuration
Counter register
IF counter register (IFCR)
Control registers
IF counter mode select register (IFCMD)
IF counter control register (IFCR)
IF counter gate judge register (IFCJG)
Содержание mPD178053
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