Section 19 Compare Match Timer (CMT)
Rev.1.00 Dec. 13, 2005 Page 705 of 1286
REJ09B0158-0100
19.4.8 Counter:
Rotary
Switch Operation of Updown-counter
The Updown-counter can operate as a rotary switch. When the falling edge of the control pin is
detected and then the data pin input level is low, the counter is counted up, or the data pin input
level is high, the counter is counted down. Then the timer is counted up, the IE0 flag in CMTIRQS
is set to 1, or the timer is counted down, the IE1 flag in CMTIRQS is set to 1 and the interrupt is
generated when the IEEn bit in CMTCTL is set to 1. If both the count up and count down are
detected, both the IE0 and the IE1 flags are set to 1 and the counter CMTCH0C is updated by the
most recently detected edge.
Pck
CMTCH0C
N
CMTCH0T
operation clock
CMT_CTR1 input
CMT_CTR0 input
Channel 0
Edge interrupt flag
N
+
1
Figure 19.17 Rotary Switch Operation Count-Up Timing
Pck
CMTCH0C
N
CMTCH0T
operation clock
CMT_CTR1 input
CMT_CTR0 input
Channel 1
Edge interrupt flag
N
−
1
Figure 19.18 Rotary Switch Operation Count-Down Timing
Содержание SH7780 Series
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