Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 9 16-BIT TIMER/EVENT COUNTER T (TMT)
R01UH0042EJ0500 Rev.5.00 Page 450 of 1513
Aug 12, 2011
(8) TMT0 option register 0 (TT0OPT0)
The TT0OPT0 register is an 8-bit register that sets the capture/compare operation and detects overflows.
This register can be read or written in 8-bit or 1-bit units.
Reset sets this register to 00H.
0
TT0CCS1
0
1
TT0CCR1 register capture/compare selection
The TT0CCS1 bit setting is valid only in the free-running timer mode.
Selected as compare register
Selected as capture register (cleared by the TT0CTL0.TT0CE bit = 0)
0 TT0CCS1 TT0CCS0 0 0 0 TT0OVF
654321
TT0CCS0
0
1
TT0CCR0 register capture/compare selection
The TT0CCS0 bit setting is valid only in the free-running timer mode.
Selected as compare register
Selected as capture register (cleared by the TT0CTL0.TT0CE bit = 0)
TT0OVF
Set (1)
Reset (0)
TMT0 overflow detection flag
• The TT0OVF bit is set to 1 when the 16-bit counter value overflows from FFFFH
to 0000H in the free-running timer mode or the pulse width measurement mode.
• An overflow interrupt request signal (INTTT0OV) is generated when the TT0OVF
bit is set to 1. The INTTT0OV signal is not generated in modes other than the
free-running timer mode and the pulse width measurement mode.
• The TT0OVF bit is not cleared to 0 even when the TT0OVF bit or the TT0OPT0
register are read when the TT0OVF bit = 1.
• Before clearing the TT0OVF bit to 0 after generation of the INTTT0OV signal, be
sure to confirm (by reading) that the TT0OVF bit is set to 1.
• The TT0OVF bit can be both read and written, but the TT0OVF bit cannot be set
to 1 by software. Writing 1 has no effect on the operation of TMT0.
Overflow occurred
0 written to TT0OVF bit or TT0CTL0.TT0CE bit = 0
7 <0>
TT0OPT0
After reset: 00H R/W Address: FFFFF607H
Cautions 1. Rewrite the TT0CCS1 and TT0CCS0 bits when the TT0CE bit = 0. (The
same value can be written when the TT0CE bit = 1.) If rewriting was
mistakenly performed, clear the TT0CE bit to 0 and then set these bits
again.
2. Be sure to set bits 1 to 3, 6, and 7 to “0”.