US38024-BAG1 Renesas Electronics America, US38024-BAG1 Datasheet - Page 303

• Manufacturer Part Number: US38024-BAG1
• Description: DEV EVALUATION KIT H8/38024
• Manufacturer: Renesas Electronics America
• Series: H8®r
• Type: MCUr

Specifications of US38024-BAG1

• Contents: 2G (Second-generation) Evaluation Board, HEW debugger support, Cable and CD-ROM
• For Use With/related Products: H8/38024
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The term of validity of “Interrupt factor generation signal”
Method 1 is recommended to operate for time efficiency.
All above attentions are also applied in 16-bit mode and 8-bit mode.
Method 1
1. Prohibit interrupt in interrupt handling routine (set IENFH, IENFL to 0).
2. After program process returned normal handling, clear interrupt request flags (IRRTFH,
3. After read timer control status register F (TCSRF), clear timer overflow flags (OVFH,
4. Operate interrupt permission (set IENFH, IENFL to 1).
Method 2
1. Set interrupt handling routine time to more than time that calculated with (1) formula.
2. Clear interrupt request flags (IRRTFH, IRRTFL) at the end of interrupt handling routine.
3. After read timer control status register F (TCSRF), clear timer overflow flags (OVFH,
OVFL) and compare match flags (CMFH, CMFL).
OVFL) and compare match flags (CMFH, CMFL).
IRRTFL) after more than that calculated with (1) formula.
= 1 cycle of φw + waiting time for completion of executing instruction
+ interrupt time synchronized with φ = 1/φw + ST × (1/φ) + (2/φ) (second).....(1)
ST: Executing number of execution states
Rev. 8.00 Mar. 09, 2010 Page 281 of 658
REJ09B0042-0800
Section 9 Timers