R5F3640MNFB datasheet(75/398 Pages) RENESAS

75 / 398 page

REJ09B0392-0064 Rev.0.64

Oct 12, 2007

Page 54 of 373

Under development

Preliminary Specification

Specification in this preliminary version is subject to change.

M16C/64 Group

8. Bus

8.2

Bus Control

The following describes the signals needed for accessing external devices and the functionality of soft-

ware wait.

8.2.1

Address Bus

The address bus consists of 20 lines: A0 to A19. The address bus width can be chosen to be 12, 16, or

20 bits by using the PM06 bit in the PM0 register and the PM11 bit in the PM1 register. Table 8.2 shows

the Set Value of Bits PM06 and PM11, and Address Bus Width.

NOTE:

No values other than those shown above can be set.

When processor mode is changed from single-chip mode to memory expansion mode, the address bus

is indeterminate until any external area is accessed.

8.2.2

Data Bus

When input on the BYTE pin is high (data bus is 8 bits wide), 8 lines D0 to D7 comprise the data bus;

when input on the BYTE pin is low (data bus is 16 bits wide), 16 lines D0 to D15 comprise the data bus.

Do not change the input level on the BYTE pin while in operation.

8.2.3

Chip Select Signal

The chip select (hereafter referred to as the

CS) signals are output from the CSi (i = 0 to 3) pins. These

pins can be chosen to function as I/O ports or as

CS by using the CSi bit in the CSR register. Figure 8.1

shows the CSR Register.

During 1-Mbyte mode, the external area can be separated into up to 4 by the

CSi signal which is output

from the

CSi pin. During 4-Mbyte mode, CSi signal or bank number is output from the CSi pin. Refer to

9. “Memory Space Expansion Function”

. Figure 8.2 shows Examples of Address Bus and

CSi Sig-

nal Output in 1-Mbyte mode.

Table 8.2

Set Value of Bits PM06 and PM11, and Address Bus Width

Bits Set Value (1)

Pin Function

Address Bus Width

PM11 = 1

P3_4 to P3_7

12 bits

PM06 = 1

P4_0 to P4_3

PM11 = 0

A12 to A15

16 bits

PM06 = 1

P4_0 to P4_3

PM11 = 0

A12 to A15

20 bits

PM06 = 0

A16 to A19

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