Datasheet

Section 13 8-Bit Timers (TMR)

(This function is not available in the H8S/2695)

Page 678 of 1434 R01UH0166EJ0600 Rev. 6.00

Mar 02, 2011

H8S/2633 Group, H8S/2633 F-ZTAT

H8S/2633R F-ZTAT

, H8S/2695

13.4 Interrupts

13.4.1 Interrupt Sources and DTC Activation

(The H8S/2695 does not have a DTC function or an 8-bit timer)

There are three 8-bit timer interrupt sources: CMIA, CMIB, and OVI. Their relative priorities are

shown in table 13.3. Each interrupt source is set as enabled or disabled by the corresponding

interrupt enable bit in TCR, and independent interrupt requests are sent for each to the interrupt

controller. It is also possible to activate the DTC by means of CMIA and CMIB interrupts.

Table 13.3 8-Bit Timer Interrupt Sources

Channel Interrupt Source Description DTC Activation Priority

0 CMIA0 Interrupt by CMFA Possible High

CMIB0 Interrupt by CMFB Possible

OVI0 Interrupt by OVF Not possible

1 CMIA1 Interrupt by CMFA Possible

CMIB1 Interrupt by CMFB Possible

OVI1 Interrupt by OVF Not possible

2 CMIA2 Interrupt by CMFA Possible

CMIB2 Interrupt by CMFB Possible

OVI2 Interrupt by OVF Not possible

3 CMIA3 Interrupt by CMFA Possible

CMIB3 Interrupt by CMFB Possible

OVI3 Interrupt by OVF Not possible Low

Note: This table shows the initial state immediately after a reset. The relative channel priorities

can be changed by the interrupt controller.

13.4.2 A/D Converter Activation

The A/D converter can be activated only by channel 0 compare match A.

If the ADTE bit in TCSR0 is set to 1 when the CMFA flag is set to 1 by the occurrence of channel

0 compare match A, a request to start A/D conversion is sent to the A/D converter. If the 8-bit

timer conversion start trigger has been selected on the A/D converter side at this time, A/D

conversion is started.