SH7059 Datasheet, PDF (383/1042 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

11. Advanced Timer Unit-II (ATU-II)
Pφ
TI9A
Edge
detection
signal
ECNT9A
Clock
ECNT9A
GR9A
TSR9
CMF9A
Capture
trigger
To channel 3
00
01
02 03
10
00
05
06
10
Cleared by software
Rising and falling edges
Falling edge
Figure 11.24 Event Count Operation
Rising edge
Pφ
TCNT3
Clock
TCNT3 0000
Compare-match
trigger
(from channel 9)
GR3A
0001
0002
0003
0004
0005
0004
5678
5679
567A
567B
567C
567D
567E
567A
TSR3
IMF3A
Cleared by software
Figure 11.25 Event Cycle Measurement Operation
11.3.12 Channel 10 Functions
Inter-Edge Measurement Function and Edge Input Cessation Detection Function:32-bit input capture register 10A
(ICR10A) and 32-bit output compare register 10A (OCR10A) in channel 10 unconditionally perform input capture and
compare-match operations, respectively. These registers are connected to 32-bit free-running counter TCNT10A.
When the corresponding bit is set in the timer start register (TSTR), the entire channel 10 starts operating. ICR10A has an
external input pin (TI10), and when an edge is input at this input pin, ICR10A captures the TCNT10A value. At this time,
TCNT10A is cleared to H'00000001. The captured value is transferred to the read register (RLD10C) in the multiplied
clock generation block. By making the appropriate setting in the interrupt enable register (TIER), an interrupt request can
be sent to the CPU. This allows inter-edge measurement to be carried out.
When TCNT10A reaches the value set in OCR10A, a compare-match interrupt can be requested. In this way it is possible
to detect the cessation of edge input beyond the time set in OCR10A.
The input edge from TI10 is synchronized internally; the internal signal is AGCK. Noise cancellation is possible for edges
input at TI10 using the timer 10H (TCNT10H) input cancellation function by setting the NCE bit in timer control register
TCR10. When an edge is input at TI10, TCNT10H starts and input is disabled until it reaches compare-match register
NCR10.
Rev.3.00 Mar. 12, 2008 Page 293 of 948
REJ09B0177-0300