TC9256, 57APG/AFG

2006-07-14

12

General-Purpose Counter

The general-purpose counter is a 20-bit counter. It has such uses as counting AM/FM band intermediate

frequencies (IF) and detecting auto-stop signals during auto-search tuning. It also features a cycle measurement

function for such uses as measuring low-frequency pilot signal cycles. The TC9256APG and TC9256AFG do not

1.

General-Purpose Counter Control Bits

(1)

Bits G0 and G1 ......................... Used for selecting the general-purpose counter gate time.

(2)

Bits SC, IF1 and IF2................. I/O port and general-purpose counter switching bits.

The functions of the following pins are switched by data.

Note 1: Pin names in parentheses “(

)” apply to the TC9256APG and TC9256AFG.

Note 2: Bits marked with “(*1)” cannot be set on the TC9256APG and TC9256AFG.