參數(shù)資料
型號: MC705L16CFUE
廠商: Freescale Semiconductor
文件頁數(shù): 104/146頁
文件大?。?/td> 0K
描述: IC MCU 8BIT EPROM 80-QFP
標準包裝: 84
系列: HC05
核心處理器: HC05
芯體尺寸: 8-位
速度: 2.1MHz
連通性: SPI
外圍設備: LCD,POR,WDT
輸入/輸出數(shù): 16
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: OTP
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 80-QFP
包裝: 托盤
Oscillators/Clock Distributions
MC68HC05L16 MC68HC705L16 Data Sheet, Rev. 4.1
60
Freescale Semiconductor
7.3 System Clock Control
The system clock is provided for all internal modules except timebase. Both OSC and XOSC are available
as the system clock source. The divide ratio is selected by the SYS1 and SYS0 bits in the MISC register.
By default, OSC/64 is selected on reset.
NOTE
Do not switch the system clock to XOSC (SYS1 and SYS0 = 11) when
XOSC clock is not available. The XOSC clock is available when STUP flag
is set.
Do not switch the system clock to OSC (SYS1 and SYS0 = 00, 01, or 10)
when OSC clock is not available. The OSC clock is available when FTUP
flag is set.
7.4 OSC and XOSC
The secondary oscillator (XOSC) runs continuously after power up. The main oscillator (OSC) can be
stopped to conserve power via the STOP instruction or the FOSCE bit in the MISC register. The effects
of restarting the OSC will vary depending on the current state of the MCU, including SYS0, SYS1, and
FOSCE.
7.4.1 OSC on Line
If the system clock is OSC, FOSCE should remain logic 1. Executing the STOP instruction in this condition
will halt OSC, put the MCU into a low-power mode, and clear the 6-bit POR counter. The 7-bit divider is
not initialized. Exiting STOP with external IRQ or reset re-starts the oscillator. When the POR counter
overflows, internal reset is released and execution can begin. The stabilization time will vary between
8064 and 8192 counts.
NOTE
Exiting STOP with external reset will always return the MCU to the state as
defined by the default register definitions, for example,
SYS0:SYS1 = 1:0, FOSCE = 1.
Table 7-1. System Bus Clock Frequency Selection
SYS1 SYS0
Divide Ratio
CPU Bus Frequency (Hz)
OSC = 4.0 M
OSC = 4.1943 M
XOSC = 32.768 k
00
OSC
÷ 2
2.0 M
2.0972 M
01
OSC
÷ 4
1.0 M
1.0486 M
10
OSC
÷ 64
62.5 k
65.536 k
11
XOSC
÷ 2
16.384 k
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