r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 790

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 11 16-Bit Timer Pulse Unit (TPU)
11.10
11.10.1 Module Stop Mode Setting
TPU operation can be disabled or enabled using the module stop control register. The initial
setting is for TPU operation to be halted. Register access is enabled by clearing module stop
mode. For details, refer to section 24, Power-Down Modes.
11.10.2 Input Clock Restrictions
The input clock pulse width must be at least 1.5 states in the case of single-edge detection, and at
least 2.5 states in the case of both-edge detection. The TPU will not operate properly with a
narrower pulse width.
In phase counting mode, the phase difference and overlap between the two input clocks must be at
least 1.5 states, and the pulse width must be at least 2.5 states. Figure 11.45 shows the input clock
conditions in phase counting mode.
Rev. 1.00 Sep. 19, 2008 Page 762 of 1270
REJ09B0466-0100
Figure 11.45 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
TCLKA
(TCLKC)
TCLKB
(TCLKD)
Notes: Phase difference and overlap
Usage Notes
Pulse width
Overlap
Pulse width
Phase
rence
diffe-
Overlap
: 1.5 states or more
: 2.5 states or more
Phase
rence
diffe-
Pulse width
Pulse width
Pulse width