Fujitsu MB91401 Bit1, bit0 WTH1, WTH0 Bus width setting bits, Function Remarks, Operation mode

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Prelminary

MB91401

2004.11.12

[bit1, bit0] WTH1, WTH0 (Bus width setting bits)

These bits specify the bus width. The value of the bits is set in the DBW1 and DBW0 bits in ACR0 (CSO area). Set these bits to a value other than “11”.

WTH1

WTH0

Function

Remarks

 

 

 

 

0

0

8-bit bus width

External bus mode

 

 

 

 

0

1

16-bit bus width

External bus mode

 

 

 

 

1

0

32-bit bus width

External bus mode

 

 

 

 

1

1

Setting disabled

 

 

 

 

 

•Operation mode

In the operation mode, there are a bus mode and an access mode.

Bus mode

External ROM

bus

Access mode

32-bit bus width

16-bit bus width

8-bit bus width

Bus mode

In bus mode, the operations of internal ROM and the external access functions are controlled according to the mode setting pins (MD2 to MD0) and the values of mode data.

Although the FR71 architecture supports this bus mode, this macro cannot use the single-chip or internal ROM/ external bus mode but can use the external ROM/external bus mode only.

Access mode

Access mode indicates the mode that controls the external data bus width, and is specified by the WTH1/WTH0 bits, and the DBW1/DBW0 bits within ACR0 to ACR7 (Area Configuration Registers).

Bus mode

The FR family has three bus modes described below. Please refer to “■ MEMORY SPACE” for details.

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Contents Features DescriptionPackage General Purpose IO Gpio Packet filtering functionMemory Interface USB Function ControllerI2C Interface Card Interface CompactFlashIndex E F G H J K L M N P R T U V W PIN AssignmentPIN Number Table GND PIN DescriptionFunction/application Pin name Pin noICS2 BreakiICS1 OUT ICS0SIN0 SIN1SOUT1 SOUT0MB91401 Rxer RxclkRxdv RxcrsEXA ExcsxEXD15 EXD14UDM UDPUsbins UCLK48CFD11 CFD15 CFD14 CFD13 CFD12CFD10 CFD9 CFD8MB91401 SCL SDAPllvdd PllvssCircuit Type Type Circuit RemarksUSB I/O Circuit Remarks Separation of power supply pattern Handling DevicesPreventing Latch-up Treatment of Open pins Treatment of the unused pinsTreatment of output pins About power supply pinsAttached cable Part number Remarks Connected Specification of MB91401 and ICEEvaluation MCU terminal name Pin treatment Signal line name Wiring regulationsRST UV CCPin name Function OscebCircuit constants Description Holding request withdrawal demand function OFF Bit data busAbout Mode pins MDI2 to MDI0 Treatment of Unused Input PinsAbout watch dog timer Operation at start-upAndb AndhORH ORBDMA Step execution of Reti instruction Trace modeOperand break Interrupt handler to NMI request toolAuthentication macro Block DiagramMemory Space General Purpose Registers Mode Pins Mode SettingsMode Register Modr RegisterBit1, bit0 WTH1, WTH0 Bus width setting bits Operation modeFunction Remarks Address Register Block MAPDRCL1 W UTIMC1 R/W TIMER1 DRCL0 W UTIMC0 R/W TIMER0SIDR0 R/W UART0BSD0 Xxxxxxxx Ichrc R/WBSD1 Xxxxxxxx BsdcAddress Register Block DMADA0 Xxxxxxxx DMASA0 XxxxxxxxDMASA1 Xxxxxxxx DMADA1 Xxxxxxxx1XXXXXXX Bsrr BCRR/W CCRR/W ADRR/WDARR/W BC2RR/W Xxxxxxxx 010FFFFF HSMICMDR/W Smistatusr SIM if Xxxxxxxx SmiintenableSmicmdst 00XXXXXX SIM ifExiftxdr W Exifrxdr RExifrxrr ExiftxrwFIFO1R FIFO2W XXXXXXXX-XXXXXXXX XXXXXXXX-XXXXXXXXFIFO3W XXXXXXXX-XXXXXXXX CONT1R/W XXXXX0XX-XXX00000XXXXXXXX-X0000000 XXXXXXXX-XXX00000 Interrupt Address of TBR Interrupt source Offset Interrupt VectorDefault NMI Non Maskable Interrupt Interrupt Address of TBR Interrupt source OffsetParameter Symbol Rating Unit Electrical CharacteristicsMin ΣiolTyp Parameter Symbol Value UnitParameter CfresetPin Conditions Value Unit Min Typ TCK/TRST/TMS TDI/TDOPin Conditions Value Unit Input Levels High driven Vcrs standard range VDDE/2 UsbcMclko Reset Parameter Pin ConditionsUnit Remarks Min RDX Mclko ↑ Mclko ↑RDY Mclko ↑ SOUT1, SOUT0 SCK1, SCK0SIN1, SIN0 Sclk ↑Internal shift clock mode Txen Txclk ↑ Rxdv Rxclk ↑Rxer Rxclk ↑ Reception OUT → Mdio Mdclk ↑External if Parameter Symbol Pin Value Unit Remarks MinWrite access UDP, UDM USB interface Parameter Symbol PinFull-speed Buffer Pclk 10 I2C interfaceSCL Pclk SDA PclkCard if CFCE2X, CFCE1XCFOEX, Cfiordx Value Unit Remarks Min Max Parameter SymbolCFWEX, Cfiowrx CDWEX, CfiowrxPart number Package Remarks Ordering InformationPackage Dimension Memo North and South America JapanEurope Asia Pacific

MB91401 specifications

The Fujitsu MB91401 microcontroller is a versatile device designed for automotive applications, embedded systems, and industrial control. It belongs to the MB91400 series, known for its robustness and efficiency. This series integrates advanced features and technologies that cater to a wide variety of real-time applications.

One of the standout features of the MB91401 is its 32-bit RISC architecture, which operates at clock speeds up to 40 MHz. This high-performance core enables rapid processing and data handling, making it suitable for demanding applications. The microcontroller is equipped with a generous amount of Flash memory, allowing developers to store essential firmware and applications directly on the chip, enhancing reliability and reducing design complexity.

Another key characteristic is its extensive memory configuration, which includes SRAM for data storage and EEPROM for non-volatile data retention. This combination provides flexibility for developers, enabling them to tailor the memory allocation based on specific application requirements.

The MB91401 is designed with a focus on peripheral integration. It features multiple I/O ports, timer units, and A/D converters, making it an ideal choice for applications that require precise timing and analog signal processing. The analog-to-digital converters offer high resolution and fast conversion speeds, which are critical in automotive and industrial control systems where accuracy is paramount.

Safety is a critical consideration in automotive applications, and the MB91401 addresses this with built-in diagnostic features and error detection capabilities. These features help ensure that the application remains functional and safe under various operating conditions.

In terms of connectivity, the microcontroller supports various communication protocols, including CAN, UART, and SPI, facilitating seamless integration with other systems and devices. This is particularly important in automotive applications where communication between different electronic control units (ECUs) is essential for overall system functionality.

The Fujitsu MB91401 is also designed for low power consumption, making it suitable for battery-operated devices and energy-sensitive applications. Its various power-saving modes allow developers to optimize the system's performance while extending operational life.

In summary, the Fujitsu MB91401 is a powerful and flexible microcontroller that combines high-performance processing with extensive peripheral support and safety features. Its robust architecture and energy-efficient design make it an excellent choice for a wide range of automotive and industrial applications, promoting both reliability and innovation in embedded system development.
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