H8SLASH3028F datasheet(428/923 Pages) RENESAS

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Rev. 2.00, 09/03, page 398 of 890

10.4.6

Input Capture Setting

The 8TCNT value can be transferred to TCORB on detection of an input edge on the input

capture/output compare pin (TMIO1 or TMIO3). Rising edge, falling edge, or both edge detection

can be selected. In 16-bit count mode, 16-bit input capture can be used.

Setting Input Capture Operation in 8-Bit Timer Mode (Normal Operation)

• Channel 1:

 Set TCORB1 as an 8-bit input capture register with the ICE bit in 8TCSR1.

 Select rising edge, falling edge, or both edges as the input edge(s) for the input capture

signal (TMIO1) with bits OIS3 and OIS2 in 8TCSR1.

 Select the input clock with bits CKS2 to CKS0 in 8TCR1, and start the 8TCNT count.

• Channel 3:

 Set TCORB3 as an 8-bit input capture register with the ICE bit in 8TCSR3.

 Select rising edge, falling edge, or both edges as the input edge(s) for the input capture

signal (TMIO3) with bits OIS3 and OIS2 in 8TCSR3.

 Select the input clock with bits CKS2 to CKS0 in 8TCR3, and start the 8TCNT count.

Note: When TCORB1 in channel 1 is used for input capture, TCORB0 in channel 0 cannot be

used as a compare match register.

Similarly, when TCORB3 in channel 3 is used for input capture, TCORB2 in channel 2

cannot be used as a compare match register.

Setting Input Capture Operation in 16-Bit Count Mode

• Channels 0 and 1:

 In 16-bit count mode, TCORB0 and TCORB1 function as a 16-bit input capture register

when the ICE bit is set to 1 in 8TCSR1.

 Select rising edge, falling edge, or both edges as the input edge(s) for the input capture

signal (TMIO1) with bits OIS3 and OIS2 in 8TCSR0. (In 16-bit count mode, the settings of

bits OIS3 and OIS2 in 8TCSR1 are ignored.)

 Select the input clock with bits CKS2 to CKS0 in 8TCR1, and start the 8TCNT count.

• Channels 2 and 3:

 In 16-bit count mode, TCORB2 and TCORB3 function as a 16-bit input capture register

when the ICE bit is set to 1 in 8TCSR3.

 Select rising edge, falling edge, or both edges as the input edge(s) for the input capture

signal (TMIO3) with bits OIS3 and OIS2 in 8TCSR2. (In 16-bit count mode, the settings of

bits OIS3 and OIS2 in 8TCSR3 are ignored.)

 Select the input clock with bits CKS2 to CKS0 in 8TCR3, and start the 8TCNT count.

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