EM73P362 datasheet(22/44 Pages) EMC

22 / 44 page

This specification are subject to be changed without notice.

11.1.2001

EM73P362

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

CONTR

CONTROL OF HIGH SPEED COUNTER

OL OF HIGH SPEED COUNTER

The high speed counter is controlled by the command registers (P17, P18) :

P17

Initial value : 0000

MODE

RATE

MODE

Selection of HTC mode

0 0

Disable HTC

0 1

Melody mode

1 0

Auto load timer mode

1 1

Resistor to frequency oscillation mode

RATE

Internal pulse rate / Counter start request frequency

( Hz )

Resistor to frequency

Auto load timer mode / Melody

oscillation mode

mode internal pulse rate

0 0

XIN / 210

XIN / 20

0 1

XIN / 212

XIN / 22

1 0

XIN / 214

XIN / 24

1 1

XIN / 215

XIN / 26

P18

Initial value : 0000

RFIP

RFIN

RFIP

Input frequency of RFO

RFIN

Selection of RFO Pin

0 0

FRF / 2

0 0

Normal I/O

0 1

FRF / 4

0 1

P4.0 (RX) for RFO

1 0

FRF / 8

1 0

P4.2 (RY) for RFO

1 1

FRF / 16

1 1

P4.3 (RZ) for RFO

P3 and P5 are the 8-bit binary counter registers of the HTC. P3 is lower nibble register and P5 is higher

nibble register.

Initial value : 0000 0000

Higher nibble register

Lower nibble register

The HTC consist of one auto-reload and presetable 8-bit binary counter, 12-bit general counter and clock

source selectors. The command register can select the internal clock pulse for the melody, auto load counter

and resistor to frequency oscillation modes. The HTC increases one at the rising edge of the clock pulses.

When the first rising edge occurs by the HTC enabled, the HTC starts counting.

EM73P362 Datasheet(PDF) 22 Page - ELAN Microelectronics Corp

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