7540 datasheet(214/366 Pages) RENESAS

214 / 366 page

2-138

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

APPLICATION

7540 Group

2.9 Reset

Fig. 2.9.6 Control procedure

“F916”

“4F16”

Initialization

RESET

SEI

CLD

CLT

Set CPU mode register

CPUM(Address 3B16)

10 0

Single-chip mode

On-chip oscillator oscillation enabled

f(XIN) oscillation (ceramic/RC)

enabled

Ceramic oscillation

Applied from on-chip oscillator

00 :

φ=f(XIN)/2 (High-speed mode)

01 :

φ=f(XIN)/8 (Middle-speed mode)

10 : Applied from on-chip oscillator

(Note 2)

11 :

φ=f(XIN) (Double-speed mode)

“FF16”

Processing

CLI

Read prescaler Y and timer Y and

compare their complement with the setting

values of prescaler Z and timer Z

Timer Z interrupt processing routine

Processing

RTI

Set CPU mode register

CPUM(Address 3B16)

TYZM(Address 2016)

TCSS(Address 2E16)

Timer Y count source:

On-chip oscillator selected

Timer Z: f(XIN)/2 selected

Timer Y: Timer mode selected

Timer Y count stop

Timer Z: Timer mode selected

Timer Z count stop

Set timer Y, Z mode register

Set “0” to the timer Y interrupt enable bit.

(Timer Y interrupt disabled)

Set “0” to the timer Z interrupt enable bit.

(Timer Z interrupt disabled)

Prescaler Y (Address 2116)

Set value to prescaler Y, timer Y

Timer Y (Address 2316)

Set timer count source set register

Set value to prescaler Z, timer Z (Note 3)

Prescaler Z (Address 2516)

Timer Z primary (Address 2716)

Set “1” to the timer Z interrupt enable bit.

(Timer Z interrupt enabled)

Set “0” to the timer Y interrupt request bit.

Set “0” to the timer Z interrupt request bit.

TYZM(Address 2016)

Timer Y count start

Timer Z count start

Set timer Y, Z mode register

Timer Z

division

ratio

Timer Z

primary

Notes 1: For the concrete time, ask the oscillator manufacture.

2: In this example, this setting cannot be selected.

3: 10 ms = 1/4 MHz ✕ 2 ✕ (F916 + 1) ✕ (4F16 + 1)

Prescaler Z

Wait until f(XIN) oscillation is stabilized (Note 1)

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