Section 9 16-Bit Timer Pulse Unit (TPU)
Rev. 3.00 Mar. 14, 2006 Page 337 of 804
REJ09B0104-0300
P
φ
Address
Status flag
Interrupt request
signal
Source address
Destination address
Period of flag clearing
Period of interrupt request signal clearing
Period in which the next transfer request is masked
DMAC
read cycle
DMAC
write cycle
Figure 9.45 Timing for Status Flag Clearing by DMAC Activation (2)
9.9 Usage
Notes
9.9.1
Module Stop Mode Setting
Operation of the TPU can be disabled or enabled using the module stop control register. The initial
setting is for operation of the TPU to be halted. Register access is enabled by clearing module stop
mode. For details, refer to section 19, Power-Down Modes.
9.9.2 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 9.46 shows the input clock
conditions in phase counting mode.
TCLKA
(TCLKC)
TCLKB
(TCLKD)
Overlap
Phase
difference
Pulse width
Note: Phase difference, Overlap
≥
1.5 states
Pulse width
≥
2.5 states
Pulse width
Phase
difference
Overlap
Pulse width
Pulse width
Figure 9.46 Phase Difference, Overlap, and Pulse Width in Phase Counting Mode
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