SH7616 datasheet(144/935 Pages) RENESAS

144 / 935 page

Section 3 Oscillator Circuits and Operating Modes

Rev. 2.00 Mar 09, 2006 page 118 of 906

REJ09B0292-0200

• Modes 0–6

PLL circuits 1 and 2 halted

EXTAL input or crystal resonator used (modes 0–3)

CKIO input (modes 4–6)

FR3

FR2

FR1

FR0

φφφφ

CKIO

000

×1

×1/4

×1

100

×1

×1/2

×1/4

×1

101

×1

×1/2

×1/4

×1

110

×1

×1/2

×1

000

×1

×1/4

×1

001

×1

×1/2

×1/4

×1

010

×1

×1/2

×1

100

×1

×1/4

×1

110

×1

×1/2

×1

111

×1

Note:

Do not use combinations other than those shown above.

Frequency Change: When PLL circuit 1 or PLL circuit 2 becomes operational after modifying

the frequency modification register (including modification the frequency modification register in

the operating state), access the frequency modification register using the following procedure, and

noting the cautions listed below.

Frequency change procedure

• Set the on-chip watchdog timer (WDT) overflow time to secure the PLL circuit oscillation

settling time (CKS2–CKS0 bits in WTCSR).

• Clear the WT/IT and TME bit to 0 in WTCSR.

• Perform a read anywhere in an external memory area 0–4 cache-through area.

• Change the frequency modification register to the target frequency, or change the

operating/halted state of the PLL circuits 1 and 2 (the clocks will stop temporarily inside the

chip).

• The oscillation circuits operate, and the clock is supplied to the WDT. This clock increments

the WDT.

• On WDT overflow, supply of a clock with the frequency set in frequency setting bits FR3–FR0

begins. In this case, the OVF bit in WTSCR and the WOVF bit in RSTCSR are not set, an

interval timer interrupt (ITI) is not requested, and the

WDTOVF signal is not asserted.

SH7616 Datasheet(PDF) 144 Page - Renesas Technology Corp

SH7616 Datasheet(HTML) 144 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL