Datasheet

Section 14 Timer Z

Rev. 3.00 Mar. 15, 2006 Page 269 of 526

REJ09B0060-0300

2. When GR is an input capture register

When an input capture occurs, the value in TCNT is transferred to the general register and the

value previously stored in the general register is transferred to the buffer register.

This operation is illustrated in figure 14.36.

TCNT

Buffer register

General

Input capture

signal

Figure 14.36 Input Capture Buffer Operation

3. Complementary PWM Mode

When the counter switches from counting up to counting down or vice versa, the value of the

buffer register is transferred to the general register. Here, the value of the buffer register is

transferred to the general register in the following timing:

A. When TCNT_0 and GRA_0 are compared and their contents match

B. When TCNT_1 underflows

4. Reset Synchronous PWM Mode

The value of the buffer register is transferred from compare match A0 to the general register.

5. Example of Buffer Operation Setting Procedure

Figure 14.37 shows an example of the buffer operation setting procedure.

[1] Designate GR as an input capture register or

output compare register by means of TIOR.

[2] Designate GR for buffer operation with bits

BFD1, BFC1, BFD0, or BFC0 in TMDR.

[3] Set the STR bit in TSTR to 1 to start the count

operation of TCNT.

[1]

[2]

[3]

Select GR function

Set buffer operation

Start count operation

Buffer operation

Figure 14.37 Example of Buffer Operation Setting Procedure