7751 datasheet(33/540 Pages) RENESAS

Part #	7751

Description	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	540 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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33 / 540 page

CENTRAL PROCESSING UNIT (CPU)

7751 Group User’s Manual

2–14

2.2 Bus interface unit

(4)

Bus control

To perform the above operations (1) to (3), the BIU inputs and outputs the control signals, and

controls the address bus and the data bus. The cycle in which the BIU controls the bus and accesses

the memory•I/O device is called the bus cycle. Table 2.2.2 shows the bus cycle at accessing the

internal area.

Refer to “Chapter 12. CONNECTION WITH EXTERNAL DEVICES” about the bus cycle at accessing

the external devices.

Table 2.2.2 Bus cycle at accessing internal area

RAM

ROM

SFR

In low-speed running (f(XIN)

≤ 25 MHz)

Internal address bus

Internal data bus

Address

Data

1 bus cycle = 3

1 bus cycle = 2

Address

Internal address bus

Internal data bus

Data

Internal address bus

Internal data bus

1 bus cycle = 2

Address

Data

In high-speed running (f(XIN)

≤ 40 MHz)

7751 Datasheet(PDF) 33 Page - Renesas Technology Corp