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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 (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