参数资料
型号: S3P9664-AM
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDIP24
封装: 0.300 INCH, SDIP-24
文件页数: 117/148页
文件大小: 784K
代理商: S3P9664-AM
CLOCK CIRCUIT
S3C9664/P9664 (Preliminary Spec)
7-2
SYSTEM CLOCK CONTROL REGISTER (CLKCON)
The system clock control register, CLKCON, is located in location D4H. It is read/write addressable and has the
following functions:
— Oscillator IRQ wake-up function enable/disable (CLKCON.7)
— Oscillator frequency divide-by value: non-divided, 2, 8, or 16 (CLKCON.4 and CLKCON.3)
The CLKCON register controls whether or not an external interrupt can be used to trigger a Stop mode release
(This is called the "IRQ wake-up" function). The IRQ wake-up enable bit is CLKCON.7.
After a
RESET, the external interrupt oscillator wake-up function is enabled, the main oscillator is activated, and
the fOSC/16 (the slowest clock speed) is selected as the CPU clock. If necessary, you can then increase the
CPU clock speed to f
OSC, fOSC/2 or fOSC/8.
.7
.6
.5
.4
.3
.2
.1
.0
LSB
MSB
System Clock Control Register (CLKCON)
D4H, R/W
No effect
Divide-by selection bits for
CPU clock frequency:
00 = fosc/16
01 = fosc/8
10 = fosc/2
11 = fosc(non-divided)
Oscillator IRQ wake-up enable bit:
0 = Enable IRQ for main system
oscillator wake-up function
1 = Disable IRQ for main system
oscillator wake-up function
No effect
Figure 7-3. System Clock Control Register (CLKCON)
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