參數(shù)資料
型號(hào)： MC68HC05E1MDW
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝： SOIC-28
文件頁(yè)數(shù)： 65/86頁(yè)
文件大?。?/td> 709K
代理商： MC68HC05E1MDW
General Release Specication
MC68HC05E1 — Revision 2.0
68
Timer, Phase-Locked Loop, and Custom Periodic Interrupt
MOTOROLA
Timer, Phase-Locked Loop, and Custom Periodic
PS1: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. These bits should not be written if BCS
in the PLLCR is at a logic high. Reset clears PS1 and sets PS0,
choosing a bus clock frequency of 1.049 MHz.
NOTE:
For the standard MC68HC05E1, the 4.194 MHz bus clock frequency
should never be selected, and the 2.097 MHz bus clock frequency
should not be selected when running the part below VDD = 4.5 V. For the
high speed MC68HSC05E1, the 4.194 MHz bus clock frequency should
not be selected when running the part below V
DD = 4.5 V.
6.4.2 Operation During STOP Mode
The PLL is switched to low frequency bus rate and is temporarily turned
off when STOP is executed. Coming out of STOP mode with an external
IRQ, the PLL is turned on with the same configuration it had before going
into STOP with the exception of BCS which is reset. Otherwise, the PLL
control register is in the reset condition.
Table 6-4. PS1 and PS0 Speed Selects
with 32.768 kHz Crystal
PA1:PS0
CPU BUS CLOCK FREQUENCY (fOP)
00
524 kHz
01
1.049 MHz
Reset Condition
10
2.097 MHz
See Note below
11
4.194 MHz
See Note below
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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