M37225M6_15 datasheet(89/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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89 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 87 of 124

REJ03B0136-0100Z

8.13 CLOCK GENERATING CIRCUIT

The built-in clock generating circuit is shown in Figure 8.13.3. When

the STP instruction is executed, the internal clock

φ stops at HIGH.

At the same time, timers 3 and 4 are connected by hardware and

“FF16” is set in timer 3 and “0716” is set in the timer 4. Select f(XIN)/16

as the timer 3 count source (set bit 0 of the timer mode register 2 to

“0” before the execution of the STP instruction). Moreover, set the

timer 3 and timer 4 interrupt enable bits to disabled (“0”) before ex-

ecution of the STP instruction). The oscillator restarts when external

interrupt is accepted. However, the internal clock

φ keeps its HIGH

until timer 4 overflows, allowing time for oscillation stabilization when

a ceramic resonator or a quartz-crystal oscillator is used.

When the WIT instruction is executed, the internal clock

φ stops in

the HIGH but the oscillator continues running. This wait state is re-

leased when an interrupt is accepted (See note). Since the oscillator

does not stop, the next instruction can be executed at once.

When returning from the stop or the wait state, to accept an interrupt,

set the corresponding interrupt enable bit to “1” before executing the

STP or the WIT instructions.

Note: In the wait mode, the following interrupts are invalid.

• VSYNC interrupt

• OSD interrupt

• Timer 2 interrupt using external clock input from TIM2 pin as count

source

• Timer 3 interrupt using external clock input from TIM3 pin as count

source

• Timer 4 interrupt using f(XIN)/2 as count source

• Timer 1 interrupt using f(XIN)/4096 as count source

• f(XIN)/4096 interrupt

• Multi-master I2C-BUS interface interrupt

• A-D conversion interrupt

• SPRITE interrupt

A circuit example using a ceramic resonator (or a quartz-crystal os-

cillator) is shown in Figure 8.13.1. Use the circuit constants in accor-

dance with the resonator manufacture’s recommended values. A cir-

cuit example with external clock input is shown in Figure 8.13.2. In-

put the clock to the XIN pin, and open the XOUT pin.

Fig.8.13.1 Ceramic Resonator Circuit Example

Fig.8.13.2 External Clock Input Circuit Example

XIN

XOUT

CIN

Microcomputer

COUT

XIN

Microcomputer

Vcc

Vss

External oscillation circuit

Fig.8.13.3 Clock Generating Circuit Block Diagram

Interrupt request

Interrupt disable

flag I

Reset

SQ

R

STP instruction

SQ

R

WIT

instruction

S

Q

R

STP

instruction

Reset

Internal clock

φ

1/2

1/8

Timer 3

Timer 4

XOUT

XIN

TM20

TM22

Selection gate :

Connected to black

side at reset.

TM2 : Timer mode register 2

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