ST92F120JR9T datasheet(101/320 Pages) STMICROELECTRONICS

101 / 320 page

101/320

ST92F120 - RESET AND CLOCK CONTROL UNIT (RCCU)

7.3 CLOCK MANAGEMENT

The various programmable features and operating modes of the CCU are handled by four registers:

– MODER (Mode Register)

This is a System Register (R235, Group E).

The input clock divide-by-two and the CPU clock

prescaler factors are handled by this register.

– CLKCTL (Clock Control Register)

This is a Paged Register (R240, Page 55).

The low power modes and the interpretation of

the HALT instruction are handled by this register.

– CLK_FLAG (Clock Flag Register)

This is a Paged Register (R242, Page 55).

This register contains various status flags, as

well as control bits for clock selection.

– PLLCONF (PLL Configuration Register)

This is a Paged Register (R246, Page 55).

The PLL multiplication and division factors are

programmed in this register.

Figure 46. Clock Control Unit Programming

Quartz

PLL

CK_AF

1/16

1/2

DIV2

CKAF_SEL

1/N

oscillator

MX(1:0)

source

CKAF_ST

CSU_CKSEL

6/8/10/14

XT_DIV16

DX(2:0)

CLOCK2

CLOCK1

(MODER)

(CLK_FLAG)

(CLKCTL)

(PLLCONF)

(CLK_FLAG)

CK_AF

INTCLK

Peripherals

CPU Clock Prescaler

XTSTO P

(CLK_FLAG)

Wait for Interrupt and Low Power Modes:

LPOW FI (CLKCTL) selects Low Power operation automatically on entering WFI mode.

WFI_CKSEL (CLKCTL) selects the CK_AF clock automatically, if present, on entering WFI mode.

XTSTO P (CLK_FLAG) automatically stops the Xtal oscillator when the CK_AF clock is present and selected.

and P6.5

1/4

CLK_128

(available only if mapped on ext. pin)

ST92F120JR9T 数据表(PDF) 101 Page - STMicroelectronics

ST92F120JR9T 数据表(HTML) 101 Page - STMicroelectronics

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

数据表下载

链接网址

ST92F120JR9T 数据表(PDF) 101 Page - STMicroelectronics

ST92F120JR9T 数据表(HTML) 101 Page - STMicroelectronics

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

数据表 下载

链接网址

数据表下载