MC80F0804D View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MC80F0804D

8-BIT SINGLE-CHIP MICROCONTROLLERS

Unspecified 

MC80F0704/0708/0804/0808

of Timer.

For example, in Figure 13-14 , the pulse width of captured signal

is wider than the timer data value (FFH) over 2 times. When ex-

ternal interrupt is occurred, the captured value (13H) is more little

than wanted value. It can be obtained correct value by counting

the number of timer overflow occurrence.

Timer/Counter still does the above, but with the added feature

that a edge transition at external input INTx pin causes the current

value in the Timer x register (T0,T1,T2,T3), to be captured into

registers CDRx (CDR0, CDR1, CDR2, CDR3), respectively. Af-

ter captured, Timer x register is cleared and restarts by hardware.

It has three transition modes: "falling edge", "rising edge", "both

edge" which are selected by interrupt edge selection register

IEDS. Refer to “17.4 External Interrupt” on page 85. In addition,

the transition at INTn pin generate an interrupt.

Note: The CDRn and TDRn are in same address.In the capture

mode, reading operation is read the CDRn, not TDRn because

path is opened to the CDRn.

60

October 31, 2011 Ver 1.03

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