Fujitsu FR81S User Manual
CHAPTER 1: OVERVIEW
2. Features
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : OVERVIEW
FUJITSU SEMICONDUCTOR CONFIDENTIAL
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Real-time clock (RTC) (for day, hours, minutes, seconds)
Main oscillation / sub oscillation frequency can be selected for the operation clock.
Calibration: A real-time clock (RTC) of the sub clock drive.
The main clock to sub clock ratio can be corrected by setting the real-time clock prescaler
Clock Supervisor
Monitoring abnormality (damage of crystal etc.) of sub oscillation ( 32kHz ) (dual clock products)
and main oscillation ( 4 MHz ).
When abnormality is detected, it switches to the CR clock.
Base timer : Max. 2 channels
16-bit timer
The timer mode is selected from PWM/PPG/PWC/reload.
In the cascaded mode, a pair of 16-bit timers can be used as one 32-bit timer.
CRC generation
Watchdog timer
Hardware watchdog
Software watchdog (An effective range of a clear counter can be set.)
NMI
Interrupt controller
Interrupt request batch read
Multiple interrupts from peripherals can be read by a series of registers.
I/O relocation
Peripheral function pins can be reassigned.
Low-power consumption mode
Sleep / Stop / Watch / Sub RUN mode
Stop (power shutdown) / Watch (power shutdown) mode
Power on reset
Low-voltage detection reset (External power supply and Internal power supply are independently
observed.)
Device Package : LQFP-176/144/120/100/80/64
CMOS 90nm Technology
Power supplies
5V Power supply
The internal 1.2V is generated from 5V with the voltage step-down regulator.
MB91520 Series
MN705-00010-1v0-E
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