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参数资料
| 型号： | M306V8FJFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP116 |
| 封装： | 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116 |
| 文件页数： | 58/77页 |
| 文件大小： | 2650K |
| 代理商： | M306V8FJFP |
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M306V8FJFP
Rev.1.31
Apr 18, 2005
page 59 of 363
REJ03B0082-0131
CPU Clock and Peripheral Function Clock
Two type clocks: CPU clock to operate the CPU and peripheral function clocks to operate the peripheral
functions.
(1) CPU Clock and BCLK
These are operating clocks for the CPU and watchdog timer.
The clock source for the CPU clock can be chosen to be the main clock or sub clock.
If the main clock is selected as the clock source for the CPU clock, the selected clock source can be
divided by 1 (undivided), 2, 4, 8 or 16 to produce the CPU clock. Use the CM06 bit in CM0 register and the
CM17 to CM16 bits in CM1 register to select the divide-by-n value.
After reset, the main clock divided by 8 provides the CPU clock.
During memory expansion or microprocessor mode, a BCLK signal with the same frequency as the CPU
clock can be output from the BCLK pin by setting the PM07 bit of PM0 register to “0” (output enabled).
Note that when entering stop mode from high or middle speed mode, or when the CM05 bit of CM0
register is set to “1” (main clock turned off) in low-speed mode, the CM06 bit of CM0 register is set to “1”
(divide-by-8 mode).
(2) Peripheral Function Clock(f1, f2, f8, f32, f1SIO, f2SIO, f8SIO, f32SIO, fAD, fC32)
These are operating clocks for the peripheral functions.
Of these, fi (i = 1, 2, 8, 32) and fiSIO are derived from the main clock. The clock fi is used for timers A and
B, and fiSIO is used for serial I/O. The f8 and f32 clocks can be output from the CLKOUT pin.
The fAD clock is produced from the main clock, and is used for the A/D converter.
When the WAIT instruction is executed after setting the CM02 bit of CM0 register to “1” (peripheral
function clock turned off during wait mode), or when the microcomputer is in low power dissipation mode,
the fi, fiSIO and fAD clocks are turned off.
The fC32 clock is produced from the sub clock, and is used for timers A and B. This clock can be used
when the sub clock is on.
Clock Output Function
During single-chip mode, the f8, f32 or fC clock can be output from the CLKOUT pin. Use the CM01 to
CM00 bits of CM0 register to select.
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