15 16-BIT PWM TIMERS (T16B)
15-6
Seiko Epson Corporation
S1C17M20/M21/M22/M23/M24/M25
TECHNICAL MANUAL (Rev. 1.0)
In one-shot up count mode, the counter returns to 0x0000 if it exceeds the MAX value and stops automatically
at that point.
Counter
0xffff
0x0000
(1) Repeat up count mode
Count cycle
Time
MAX value
MAX value
Software operation
Hardware operation
RUN = 1
RUN = 1
RUN = 1
RUN = 1
MODEN = 1
PRESET = 1
PRESET = 1
RUN = 0
Counter
0xffff
0x0000
(2) One-shot up count mode
Time
Data (W)
→
MC[15:0]
Data (W)
→
MC[15:0]
Data (W)
→
MC[15:0]
Data (W)
→
MC[15:0]
Data (W)
→
MC[15:0]
MODEN = 1
RUN = 0
RUN = 0
Figure 15.4.2.1 Operations in Repeat Up Count and One-shot Up Count Modes
Operations in repeat down count and one-shot down count modes
In these modes, the counter operates as a down counter and counts from the MAX value (or current value) to
0x0000.
In repeat down count mode, the counter returns to the MAX value if a counter underflow occurs and continues
counting until the T16B
n
CTL.RUN bit is set to 0. If the MAX value is altered during counting, the counter
keeps counting down to 0x0000 and continues counting down from the new MAX value after a counter under-
flow occurs.
In one-shot down count mode, the counter returns to the MAX value if a counter underflow occurs and stops
automatically at that point.
0xffff
0x0000
RUN = 1
RUN = 1
MODEN = 1
PRESET = 1
RUN = 0
Counter
(1) Repeat down count mode
Count cycle
Time
MAX value
Software operation
Hardware operation
Data (W)
→
MC[15:0]
Data (W)
→
MC[15:0]
Data (W)
→
MC[15:0]