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FUJITSU MB91460 SERIES FR60 User Manual

Page 33

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17

Chapter 2 MB91460 Rev.A/Rev.B Overview

2.Features

the range of 1 to 1.5 cycles of the resource clock (CLKP)

• PFM (pulse frequency modulator) : 16 bits x 1 channel

16-bit reload timers for generating high/low pulse waveforms

Includes clock prescaler (f

RES

/2

1

, f

RES

/2

3

, f

RES

/2

5

, f

RES

/2

6

, f

RES

/2

7

)

• Sound Generator : 1 channel

8-bit PWM signal is mixed with tone frequency from 16-bit reload counter

PWM clock by internal prescaler: f

RES

/2

0

, f

RES

/2

1

, f

RES

/2

2

, f

RES

/2

3

, f

RES

/2

4

Tone frequency: PWM frequency / 2 / (reload value + 1)

• Stepper Motor Controller : 6 channels

Four high current outputs for each channel

Two synchronized 8/10-bit PWMs per channel

Internal prescaling for PMW clock: f

RES

/1, f

RES

/4, f

RES

/5, f

RES

/6, f

RES

/8, f

RES

/10, f

RES

/12, f

RES

/16

• LCD controller

4 common / 40 segment

Display: Up to 160 cells (for 1/4 duty cycle)

Duty cycle: Selectable from options: 1/2, 1/3 and 1/4

Bias: Fixed at 1/3

Frame period: Selectable from four options. (for clock, peripheral clock or subclock is selectable)

Driver: Built-in (for internal divided resistors), or external divided resistors can be connected to the
V0-V3 pins

Data memory: Built-in 16-byte data memory for display

Stop mode: Enable LCD display in the sub-stop mode

Blank display: Selectable

Pin: The SEG0-39 of COM0-4 pin usage can be switched between general and specialized purposes

Others: External divided resistors can be also used to shut off the current when LCD is deactivated

• Timebase/watchdog timer (26 bits)

Adjustable watchdog timer interval (between 2

20

and 2

26

system clock cycles)

• RC oscillator watchdog timer (16 bits)

• Real-time clock (counts during stop mode)

RTC module can be clocked either from 32 kHz crystal, 4 MHz quartz or from the RC Oscillator

Facility to correct oscillation deviation (subclock calibration)

Read/write accessible second/minute/ hour registers

Can signal interrupts every halfsecond/second/ minute/hour/day

Internal clock divider and prescaler provide exact 1s clock based on a 4 MHz or a 32 kHz clock input

Prescaler value for 4 MHz is 0F423F

H