SH7014 datasheet(86/754 Pages) RENESAS

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3. Operating Modes

Rev.5.00 Sep. 27, 2007 Page 52 of 716

REJ09B0398-0500

3.2

Explanation of Operating Modes

Table 3.3 describes the operating modes.

Table 3.3

Operating Modes

Mode

Description

(MCU) Mode 0

CS0 area becomes an external memory space with 8-bit bus width.

(MCU) Mode 1

CS0 area becomes an external memory space with 16-bit bus width.

(MCU) Mode 2

The on-chip ROM becomes effective. The bus width for the on-chip

ROM space is 32 bit.

Mode 3 (single chip

mode)

Any port can be used, but external addresses can not be employed.

Clock mode

The input waveform frequency can be used as is, doubled or

quadrupled as an internal clock in modes 0 to 3.

3.3

Pin Configuration

Table 3.4 describes the function of each operating mode related pin.

Table 3.4

Operating Mode Pin Function

Pin Name

Input/Output

Function

XTAL

Input

Connects to a crystal oscillator

EXTAL

Input

Connects to a crystal oscillator, or used for external clock input pin

PLLCAP

Input

Connects to a capacitor for PLL circuit operation

MD0

Input

Designates operating mode through the level applied to this pin

MD1

Input

Designates operating mode through the level applied to this pin

MD2

Input

Designates clock mode through the level applied to this pin

MD3

Input

Designates clock mode through the level applied to this pin

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