EM78P311SXSSLASHXJ datasheet(42/68 Pages) EMC

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EM78P311N

8-Bit Microcontroller

•

Product Specification (V1.0) 10.02.2006

(This specification is subject to change without further notice)

8-bit Up-counter

Comparator

TCR3B

TC3CR

MUX

INT3ES

TC3 pin

TC2CK

TC3S

TC3

Interrupt

TCR3A

fc/2

Edge

Detector

Capture

Control

TC3M

Capture

CAP

Inhibit

Rising

Falling

Overflow

fs/2

Fig. 5-22 Configuration of Timer/Counter3

5.10.1 Timer Mode

In Timer mode, counting up is performed using the internal clock. When the contents of

the up-counter matched with the TCR3DA, then interrupt is generated and the counter

is cleared. Counting up resumes after the counter is cleared. The current contents of

the up-counter are loaded into the TCR3DB by setting TC3CAP to “1” and the TC3CAP

is cleared to “0” after capture automatically.

5.10.2 Counter Mode

In Counter mode, counting up is performed using the external clock input pin (TC3 pin)

and either rising or falling edge can be selected by INT3ES0 but both edge cannot

be used. When the contents of the up-counter matched with the TCR3DA, then

interrupt is generated and the counter is cleared. Counting up resumes after the

counter is cleared. The current contents of the up-counter are loaded into the TCR3DB

by setting TC3CAP to “1” and the TC3CAP is cleared to “0” after capture automatically.

5.10.3 Capture Mode

In Capture mode, the pulse width, period and duty of the TC3 input pin are measured in

this mode, which can be used in decoding the remote control signal. The counter is

free running by the internal clock. On the rising (falling) edge of TC3 pin input, the

contents of the counter is loaded into TCR3DA, then the counter is cleared and

interrupt is generated. On the falling (rising) edge of TC3 pin input, the contents of the

counter are loaded into TCR3DB. The counter is still counting, on the next rising edge

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