参数资料
型号: MC68HC705RC17P
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.097 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 112/126页
文件大小: 3079K
代理商: MC68HC705RC17P
NON-DISCLOSURE
AGREEMENT
REQUIRED
Phase-Locked Loop (PLL) Synthesizer
General Release Specification
MC68HC705RC17 Rev. 2.0
Phase-Locked Loop (PLL) Synthesizer
PLLON — PLL On
This bit activates the synthesizer circuit without connecting it to the
control circuit. This allows the synthesizer to stabilize before it can
drive the CPU clocks. When this bit is cleared, the PLL is shut off and
the BCS bit cannot be set. (Setting the BCS bit would engage the
disabled PLL onto the bus). Reset sets this bit.
NOTE:
For minimum current consumption, disable the PLL module before
entering wait mode.
NOTE:
The PLLON bit should not be cleared unless the BCS bit has been
cleared on a previous write to the register.
VCOTST — VCO Test
NOTE:
This bit is intended for use by Motorola. This bit cannot be cleared in user
mode.
PS1 and PS0 — PLL Synthesizer Speed Select
These two bits select one of four taps from the PLL to drive the CPU
clocks. These bits are used in conjunction with PLLON and BCS bits
in the PLL control register. Reset clears PS1 and sets PS0, choosing
a bus clock frequency of 524 kHz using an external crystal of
32.768 kHz.
CAUTION:
This bit should not be modified if BCS and PLLON in the PLLCR are both
at a logic high.
Table 10-1. PS1 and PS0 Speed Selects
with 32.768-kHz Crystal
PS1
PS0
CPU Bus Clock
Frequency (fOP)
0
524 kHz
0
1
1.049 MHz
Reset Condition
1
0
2.097 MHz
For 3.0 V
≤ V
DD ≤ 5.5 V
1
4.194 MHz
Do Not Select
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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