M16CSLASH62P datasheet(41/349 Pages) MITSUBISHI

41 / 349 page

Bus

Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

(10) Software Wait

Software wait states can be inserted by using the PM17 bit in the PM1 register, the CS0W to CS3W bits

in the CSR register, and the CSE register.

________

To use the RDY signal, set the corresponding CS3W to CS0W bit to “0”. Figure 1.7.6 shows the CSE

typical bus timings using software wait.

(9) External Bus Status When Internal Area Accessed

Table 1.7.6 shows the external bus status when the internal area is accessed.

Table 1.7.6. External Bus Status When Internal Area Accessed

Item

SFR accessed

Internal ROM, RAM accessed

A0 to A19

Address output

Maintain status before accessed

address of external area or SFR

D0 to D15

When read

High-impedance

When write

Output data

Undefined

RD, WR, WRL, WRH

RD, WR, WRL, WRH output

Output “H”

BHE

BHE output

Maintain status before accessed

status of external area or SFR

CS0 to CS3

Output “H”

ALE

Output “L”

Figure 1.7.6. CSE Register

Function

Bit symbol

Bit name

Chip select expansion control register

Symbol

Address

After reset

CSE

001B16

0016

CSE00W

CS0 wait expansion bit

0 0: 1 wait

0 1: 2 waits

1 0: 3 waits

1 1: Must not be set

b1 b0

CSE01W

(Note)

CSE10W

CS1 wait expansion bit

0 0: 1 wait

0 1: 2 waits

1 0: 3 waits

1 1: Must not be set

b3 b2

CSE11W

(Note)

CSE20W

CS2 wait expansion bit

0 0: 1 wait

0 1: 2 waits

1 0: 3 waits

1 1: Must not be set

b5 b4

CSE21W

(Note)

CSE30W

CS3 wait expansion bit

0 0: 1 wait

0 1: 2 waits

1 0: 3 waits

1 1: Must not be set

b7 b6

CSE31W

(Note)

Note: Set the CSiW bit (i = 0 to 3) in the CSR register to “0” (with wait state) before writing to the CSEi1W to

CSEi0W bits. If the CSiW bit needs to be set to “1” (without wait state), set the CSEi1W to CSEi0W bits to “

002” before setting it.

M16C/62P Datasheet(PDF) 41 Page - Mitsubishi Electric Semiconductor

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