TB2110FN View Datasheet(PDF) - Toshiba

Part Name

Description

Manufacturer

TB2110FN

TOSHIBA Bi−CMOS Integrated Circuit Silicon Monolithic

Toshiba 

TB2110FN

○ Programmable counter

The programmable counter section consists of 1 / 4 + 1 / 2 prescalers, 2 modulus prescaler, and 4bit + 12bit

programmable binary counters.

1. Setting the programmable counter section

The programmable counter need to be set for the divisor (16 bits) and the dividing mode (2 bits).

(1) Setting the dividing mode

Use the FM and mode bit to choose the input setting and the dividing mode (pulse swallow mode or direct

dividing mode). Four mode are available as listed below. Choose the desired one according to the

frequency bands used.

Mode FM Mode

Dividing Mode

AM

0

SW

0

FM

1

TV

1

0 Direct dividing mode

1 Pulse swallow mode

0 1 / 4 + pulse swallow mode

1 1 / 8 + pulse swallow mode

Typical

Receiving Band

LW, MW

SW

FM

TV

Input Frequency

Range

0.5~10MHz

3~40MHz

40~150MHz

50~250MHz

Input

Pin

AMIN

FMIN

(Note) ‘n’ denotes the set value.

(2) Setting the divisor

To determine the programmable counter’s divisor, set binary data to the P0~P15 bits.

· For the pulse swallow mode (16 bits, SW, FM, and TV band)

Divisor

n

n

4･n

8･n

Range of divisor set (pulse swallow mode) n = 210H~FFFFH (528~65535)

(Note) The actual divisor is 4 times the programmed number for the 1 / 4 + pulse swallow mode, and

8 times the programmed number for the 1 / 8 + pulse swallow mode.

· Direct divide method (12 bits)

Range of divisor set (direct divide mode) n = 10H~FFFH (16~4095)

(Note) In the direct divide method, the data in P0~P3 becomes irrelevant and the P4 port becomes

the LSB.

9

2002-10-30

Share Link: