M30220MCGP View Datasheet(PDF) - Renesas Electronics

Part Name

Description

MFG CO.

M30220MCGP

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Renesas Electronics 

Software Wait

Mitsubishi microcomputers

M30220 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Software wait

A software wait can be inserted by setting the wait bit (bit 7) of the processor mode register 1 (address

000516). (Note)

A software wait is inserted in the internal ROM/RAM area. When set to “0”, each bus cycle is executed in

one BCLK cycle. When set to “1”, each bus cycle is executed in two BCLK cycles. After the microcomputer

has been reset, this bit defaults to “0”. Set this bit after referring to the recommended operating conditions

(main clock input oscillation frequency) of the electric characteristics.

The SFR area is always accessed in two BCLK cycles regardless of the setting of this control bit.

Table 1.8.1 shows the software waits and bus cycles.

Note: Before attempting to change the contents of the processor mode register 1, set bit 1 of the protect

register (address 000A16) to “1”.

Table 1.8.1. Software waits and bus cycles

Area

SFR

Internal

ROM/RAM

Wait bit

Invalid

0

1

2 BCLK cycles

1 BCLK cycle

2 BCLK cycles

Bus cycle

19

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