参数资料
型号: ST92E141K4D1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, UVPROM, 25 MHz, MICROCONTROLLER, CDIP32
封装: WINDOWED, SHRINK, CERAMIC, DIP-32
文件页数: 141/178页
文件大小: 1097K
代理商: ST92E141K4D1
65/178
ST92141 - RESET AND CLOCK CONTROL UNIT (RCCU)
5.3 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 28. Clock Control Unit Programming
Quartz
PLL
1/16
x
1/2
DIV2
CKAF_SEL
1/N
oscillator
MX(1:0)
0
1
0
1
0
1
CKAF_ST
CSU_CKSEL
6/8/10/14
1
0
XT_DIV16
DX(2:0)
CLOCK2
CLOCK1
(MODER)
(CLK_FLAG)
(CLKCTL)
(PLLCONF)
(CLK_FLAG)
CK_AF
INTCLK
to
Peripherals
and
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.
1/16
CK_AF
pin
WFI and LPOWFI=1 and WFI_CKSEL = 1
0
1
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