Fujitsu MB90890 manual Product Features, Instruction set supporting C language and multitasking

New Products MB90890 Series

pave the way towards packages that meet the higher standards of safety and reliability listed below.

●An extended range of operating voltages between 3.5V and 5.5V, ensuring enhanced reliability for system operation without possible voltage drops

●A 50% or greater increase in the margin for the circuit, from the typical 0.3VCC to less than 0.5VCC. This enables recognition of the 0 level of input voltages, opening up new possibilities for the realization of noise-resistant systems

Product Features

■Configured with FUJITSU,s original high-performance F 2 MC-16LX CPU

■Minimum instruction execution time of 62.5ns (at 16MHz internal operation frequency)

■System clock speed that can be increased by integral multiples with the internal PLL clock (enables increased internal operating frequency by an integral multiple of 1 to 4 times the base oscillator frequency)

■Instruction set supporting C language and multitasking

■Four available power-saving modes

●Sleep mode (CPU clock set OFF)

●Time-base timer mode

(All timers but the time-base timer set OFF)

●Stop mode (Base oscillator set OFF)

●CPU intermittent operation mode

(CPU operating clock repeatedly toggles ON and OFF based on preset values)

■Resources

●I/O port: A maximum of 36 ports available (including four for higher-current outputs)

●18-bit time-base counter/Watchdog timer/Clock timer :1 channel

●8/16-bit PPG timer : 8-bit×4-channel, or 16-bit×2-channel

●16-bit reload timer: 2 channels

●16-bit I/O timer

16-bit free-running timer :1 channel

16-bit input capture (ICU) : 4 channels

●UART:2 channels

●DTP/external interruption circuit : 4 channels

Figure 1 Operation of Dual-Operation Flash Memory-Integrated Microcontroller Series MB90F897 Figure 2 Operational Flow of CPU Rewrite by Flash Memory

Dual-Operation Flash Memory�

(Upper Bank)
SA9：4K-byte
SA8：4K-byte	Write/erase available in one bank�

No need to transfer programs to RAM� when flash memories rewrite.

SA7：4K-byte		while a program is executed in the�
SA6：4K-byte		other bank
SA5：16K-byte
			Dual-Operation Flash Memory�
SA4：16K-byte
			(Lower Bank)
				SA3：4K-byte
	Dual-Operation			SA2：4K-byte
				SA1：4K-byte
				SA0：4K-byte
Read (Execution)			Write/Erase
		OR
Write/Erase			Read (Execution)

Existing Flash Memory

	①�
Flash�
Memory	②�
	CPU

RAM

①Rewriting from flash memory� to RAM Program transmission

Dual-Operation Flash Memory

Upper Bank	①�
Lower Bank	①�
Flash Memory	CPU

①Rewriting to flash memory

CPU

②Rewriting to flash memory

12

FIND Vol.21

No.1 2003