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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 (fRES/21, fRES/23, fRES/25, fRES/26, fRES/27)
Sound Generator : 1 channel
8-bit PWM signal is mixed with tone frequency from 16-bit reload counter
PWM clock by internal prescaler: fRES/20, fRES/21, fRES/22, fRES/23, fRES/24
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: fRES/1, fRES/4, fRES/5, fRES/6, fRES/8, fRES/10, fRES/12, fRES/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 220 and 226 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 0F423FH