參數(shù)資料
型號： MC68HC05L25PB
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, PQFP52
封裝： TQFP-52
文件頁數(shù)： 133/152頁
文件大小： 897K
代理商： MC68HC05L25PB
Miscellaneous Register
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
81
STUP — XOSC Time Up Flag
The power-on detection clears this bit. This bit is set after the time base has counted 16,264 clocks. A
reset does not affect this bit.
Read:
1 = XOSC clock available for the system clock
0 = XOSC is not stabilized or no signal on XOSC1 and XOSC2 pins
Bits 5 and 4 — Reserved
These bits are not used and always read as zero.
SYS1 and SYS0 — System Clock Select
These two bits select the system clock source. On reset the SYS1 and SYS0 bits are initialized to zero
and zero, respectively.
NOTE
Do not switch the system clock to XOSC (SYS1–SYS0 = 11) when the
XOSC clock is not available. The XOSC clock is available when the STUP
flag is set.
Do not switch the system clock to OSC (SYS1–SYS0 = 00, 01, or 10) when
the OSC clock is not available. OSC clock is available when the FTUP flag
is set.
FOSCE — Fast (Main) Oscillator Enable
The FOSCE bit controls the main oscillator activity. This bit should not be cleared by the CPU when
the main oscillator is selected as the system clock source. This bit is set on reset.
1 = When this bit is set:
1. The main oscillator starts again.
2. The FTUP flag is set by the POR counter overflow (8072 clocks) and OSC is ready to be
used as the system and time base clocks.
0 = When this bit is cleared:
1. OSC is shut down.
2. The 7-bit dividers at the OSC input and POR counter are initialized to $0078.
3. The FTUP flag is cleared.
OPTM — Option Map Select
The OPTM bit selects one of two register maps at $0000–$000F. This bit is cleared on reset.
1 = Option map selected
0 = Main register map selected
Table 8-4. System Bus Frequency Selection
SY
S1
SY
S0
Divide Ratio
φ2 CPU Bus Frequency (Hz)
OSC = 4.0 M
OSC = 4.1943 M
XOSC = 32.768 k
00
OSC Divided by 2
(Default)
2.0 M
2.0972 M
—
0
1
OSC Divided by 4
1.0 M
1.0486 M
—
1
0
OSC Divided by 64
62.5 k
65.536 k
—
1
XOSC Divided by 2
—
16.384 k
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