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參數(shù)資料
| 型號： | MC68HC05T16B |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56 |
| 封裝： | PLASTIC, SDIP-56 |
| 文件頁數(shù)： | 77/128頁 |
| 文件大?。?/td> | 734K |
| 代理商： | MC68HC05T16B |
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MOTOROLA
5-10
MC68HC05T16
TIMERS
5
5.2
MULTI-FUNCTION TIMER
The MFT provides miscellaneous function to the MC68HC05T16 MCU. It includes a timer overow
function, real-time interrupt, and COP watchdog. The external interrupt (IRQ) triggering option is
also set by this Multi-Function Timer register.
The clock base for this module is derived from the bus clock divided by four. For a 4.2MHz E (CPU)
clock, the clock base is 1.05 MHz. This clock base is then divided by an 8-stage ripple counter to
generate the timer overow. Timer overow 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 Multi-Function
Timer 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.
Register bit denitions:
TOF - Timer Overow
1 (set)
–
8-bit ripple timer overow has occurred.
0 (clear) –
No 8-bit ripple timer overow has occurred.
This bit is set when the 8-bit ripple counter overows from $FF to $00; a timer overow interrupt
will occur, if TOFIE (bit 5) is set. TOF is cleared by writing a ‘0’ to the bit.
RTIF - Real Time Interrupt Flag
1 (set)
–
A real time interrupt has occurred.
0 (clear) –
A real time interrupt has not occurred.
When RTIF is set, a CPU interrupt request is generated if RITE is set. The clock frequency that
drives the RTI circuit is E/16384 giving a maximum interrupt period of 3.9ms at a bus rate of
4.2MHz. RTIF is cleared by writing a “0” to the bit.
TOFIE - Timer Overow Interrupt Enable
1 (set)
–
TOF interrupt is enabled.
0 (clear) –
TOF interrupt is disabled.
RTIE - Real Time Interrupt Enable
1 (set)
–
Real time interrupt is enabled.
0 (clear) –
Real time interrupt is disabled.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Multi-Function Timer Register
$1C
TOF
RTIF
TOFIE
RTIE
IRQN WDOG
RT1
RT0
0000 0011
TPG
50
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