32174 查看數據表（PDF） - MITSUBISHI ELECTRIC

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32174

SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

2001-5-14 Rev.1.0

Mitsubishi Microcomputers

32170 Group, 32174 Group

SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER

Table 5 Description of Pin Function (1/5 )

Type

Power

Pin Name

VCCE

Description

Power supply

Input/Output Function

—

Supplies power (5 V or 3.3V) to external I/O ports.

supply VCCI

Power supply

—

Supplies power (3.3 V) to the internal logic.

VDD

RAM power supply —

nternal RAM backup power supply (3.3 V).

FVCC

Flash power supply —

Internal flash memory backup power supply (3.3 V).

VSS

Ground

—

Connect all VSS pins to ground (GND).

Clock

XIN,

XOUT

Clock

Input

Output

Clock input/output pins. These pins contain a PLL-based

frequency multiply-by-4, so input the clock whose frequency is quarter

the operating frequency. (XIN input = 10 MHz when CPU clock operates

at 40 MHz)

BCLK /

______

WR

System clock

Output

When this signal is System Clock(BCLK), it outputs a clock whose is twice that of

external inpout clock. (BCLK output = 20 MHz when CPU clock operates at 40

MHz). Use this clock when circuits are synchronized externally.

______

When this signal is Write(WR),during external write access it indicates the valid

data on the data bus to transfer.

OSC-VCC Power supply

—

Power supply to the PLL circuit. Connect OSC-VCC to the power supply(3.3V)

OSC-VSS

Ground

—

Connect OSC-VSS to ground.

Reset

VCNT

______

RESET

PLL control

Reset

Input

Input

This pin controls the PLL circuit. Connect a resistor and capacitor to this pin.

This pin resets the internal circuits.

Mode

MOD0

MOD1

Mode

Input

0

These pins set an operation mode.

MOD0 MOD1

Mode

0

0 Single-chip mode

0

1 Expanded external mode

1

0 Processor mode

0

(Boot mode) (Note)

1

1 (Reserved)

Address A11-A30

bus

Address

bus

Output

20 lines of address bus (A11-A30) are provided to accommodate two

channels of 2 MB memory space (max.) connected external to the chip.

A31 is not output.

In the write cycle, of the 16-bit data bus the valid byte positions to write are

_________ ________

________ _______

output as BHW/ BHE and BLW/ BLE. In read cycle, data on the entire 16-bit

data bus is read. However, only the data at the valid byte positions are

transferred to the M32R’s internal circuit.

Data bus DB0-DB15 Data bus

Input/output This 16-bit data bus connects to external device.

Note: FP pin should be “H” level in Boot Mode.

10

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