M306H7MG-XXXFP Datasheet, PDF(28/329 Page) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

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M306H7MG-XXXFP Datasheet, PDF (28/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

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M306H7MG-XXXFP/MC-XXXFP/FGFP

4. CLOCK GENERATION CIRCUIT

System clock control register 1 (Note 1)

b7 b6 b5 b4 b3 b2 b1 b0

00 00

Symbol

CM1

Address

000716

After reset

001000002

Bit symbol

Bit

Function

RW

CM10

All clock stnoapmcoentrol bit

(Notes 4, 5)

0 : Clock on

1 : All clocks off (stop mode)

RW

(b4-b1) Reserved bit

Must set to â0â

RW

CM15 XIN-XOUT drive capacity

0 : LOW

RW

select bit (Note 2)

1 : HIGH

b7 b6

CM16 Main clock division

0 0 : No division mode

RW

select bit 1 (Note 3)

0 1 : Division by 2 mode

CM17

1 0 : Division by 4 mode

1 1 : Division by 16 mode

RW

Note 1: Write to this register after setting the PRC0 bit of PRCR register to â1â (write enable).

Note 2: When entering stop mode from high or middle speed mode, or when the CM05 bit is set to â1â (main clock turned off) in low

speed mode, the CM15 bit is set to â1â (drive capability high).

Note 3: Effective when the CM06 bit is â0â (CM16 and CM17 bits enable).

Note 4: If the CM10 bit is â1â (stop mode), XOUT goes âHâ and the internal feedback resistor is disconnected. The XCIN and XCOUT

pins are placed in the high-impedance state.

Note 5: When the PM21 bit of PM2 register is set to â1â (clock modification disable), writing to the CM10 bits has no effect.

Figure 4.3 CM1 Register

Rev.2.10 Oct 25, 2006 Page 28 of 326

REJ03B0152-0210

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