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| 型號(hào)： | MC68HC05RC18P |
| 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, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 109/126頁 |
| 文件大?。?/td> | 1180K |
| 代理商： | MC68HC05RC18P |
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Carrier Modulator Transmitter (CMT)
MC68HC05RC18 — Rev. 2.1
General Release Specification
Freescale Semiconductor
Carrier Modulator Transmitter (CMT)
81
NON-DISCLOSURE
AGREEMENT
REQUIRED
9.5.3.1 End Of Cycle (EOC) Interrupt
At the end of each cycle (when the counter is reloaded from MBUFF),
the end of cycle (EOC) flag is set. If the interrupt enable bit was
previously set, an interrupt will also be issued to the CPU. The EOC
interrupt provides a means for the user to reload new mark/space values
into the MBUFF and SBUFF registers. As the EOC interrupt is coincident
with reloading the counter, MBUFF does not require additional buffering
and may be updated with a new value for the next period from within the
EOC interrupt service routine (ISR). To allow both mark and space
period values to be updated from within the same ISR, SREG is buffered
by SBUFF. The contents written to SBUFF are transferred to the active
register SREG at the end of every cycle irrespective of the state of the
EOC flag. The EOC flag is cleared by a read of the modulator control and
status register (MCSR) followed by an access of MDR2 or MDR3. The
EOC flag must be cleared within the ISR to prevent another interrupt
being generated after exiting the ISR. If the EOC interrupt is not being
used (IE = 0), the EOC flag need not be cleared.
9.5.3.2 Modulator Control and Status Register
The modulator control and status register (MCSR) contains the
modulator and carrier generator enable (MCGEN), interrupt enable (IE),
mode select (MODE), baseband enable (BASE), extended space
(EXSPC), and external interrupt mask (EIMSK) control bits, divide-by-
two prescaler (DIV2) bit, and the end of cycle (EOC) status bit.
Address:
$0014
Bit 7
654321
Bit 0
Read:
EOC
DIV
EIMSK
EXSPC
BASE
MODE
IE
MCGEN
Write:
Reset:
00000000
= Unimplemented
Figure 9-7. Modulator Control and Status Register (MCSR)
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