參數(shù)資料
型號(hào)： M68HC705UGANG
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
中文描述： 高密度互補(bǔ)金屬氧化物半導(dǎo)體（HCMOS）微控制器
文件頁(yè)數(shù)： 41/112頁(yè)
文件大?。?/td> 809K
代理商： M68HC705UGANG
MC68HC05BD3
5-1
MULTI-FUNCTION TIMER
5
5
MULTI-FUNCTION TIMER
The MFT provides miscellaneous functions to the MC68HC05BD3 MCU. It includes a timer
overflow function, real-time interrupt, and COP watchdog. The external interrupt (IRQ) triggering
option is also set by this module’s MFT Control and Status Register.
The clock base for this module is derived from the bus clock divided by four. For a 2MHz E (CPU)
clock, the clock base is 0.5MHz. This clock base is then divided by an 8-stage ripple counter to
generate the timer overflow. Timer overflow rate is thus E/1024. The output of this 8-stage ripple
counter then drives a 4-stage divider to generate real time interrupt. Hence, the clock base for real
time interrupt is E/16384. Real time interrupt rate is selected by RT0 and RT1 bits of MFT Control
and Status register. The interrupt rates are E/16384, (E/16384)/2, (E/16384)/4, and (E/16384)/8.
The selected real time interrupt rate is then divided by 8 to generate COP reset.
5.1
MFT Counter Register
The MFT counter register (MFTCR) can be read at location $0009. It is cleared by reset.
5.2
MFT Control and Status Register
Register bit definitions:
TOF - Timer Overflow
1 (set)
–
8-bit ripple timer overflow has occurred.
0 (clear) –
No 8-bit ripple timer overflow has occurred.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
MFT Control and Status Register
$1C
TOF
RTIF
TOFIE
RTIE
IRQN
RT1
RT0
0000 0011
TPG
39
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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