SH7713 datasheet(360/904 Pages) RENESAS

360 / 904 page

Section 11 On-Chip Oscillation Circuits

Rev.1.50 Aug. 30, 2006 Page 320 of 860

REJ09B0288-0150

11.4

The CPG has the following register. For details on register addresses and register access size, refer

to section 23, List of Registers.

• Frequency control register (FRQCR)

11.4.1

Frequency Control Register (FRQCR)

The frequency control register (FRQCR) is a 16-bit readable/writable register used to specify

whether a clock is output from the CKIO pin, the frequency multiplication ratio of PLL circuit 1,

and the frequency division ratio of the internal clock and the peripheral clock.

Only word access can be used on the FRQCR register. FRQCR is initialized to H’1003 by a

power-on reset, but retains its value in a manual reset and in standby mode.

The write values to bits 15 to 13, 11 to 10, 7 to 6, and 3 should always be 0.

Bit

Bit Name

Initial

Value

R/W

Description

15 to 13



All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

CKOEN

R/W

Clock Output Enable

CKOEN specifies whether a clock is output from the

CKIO pin or the CKIO pin is placed in the level-fixed

state in the standby mode, CKIO pin is fixed at low

during STATUS 1 = L, and STATUSO = H, when

CKOEN is set to 0. Therefore, the malfunction of an

external circuit because of an unstable CKIO clock in

releasing the standby mode can be prevented. The

CKIO pin becomes to input pin regardless of the

value of the CKOEN bit in clock operating mode 7.

0: CKIO pin goes to low level state in standby mode.

1: Clock is output from CKIO pin



Reserved

These bits are always read as 0. The write value

should always be 0.

SH7713 Datasheet(PDF) 360 Page - Renesas Technology Corp

SH7713 Datasheet(HTML) 360 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