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Chapter 12
16-bit 2-Phase Encoder Input Up/Down Counter/General Purpose Timer (TMENC10)
User’s Manual U16580EE3V1UD00
12.5 Operation
12.5.1 Basic
operation
The following two operation modes can be selected for TMENC10.
(1)
General-purpose timer mode (CMD bit of TUM10 register = 0)
In the general-purpose timer mode, the TMENC10 operates either as a 16-bit interval timer or as a
PWM output timer (count operation is up count only).
The count clock to TMENC10 is selected by prescaler mode register 10 (PRM10).
(2)
Up/down counter mode (UDC mode) (CMD bit of TUM10 register = 1)
In the UDC mode, TMENC10 operates as a 16-bit up/down counter.
External clock input (TIUD1, TCUD1 pins) set by PRM10 register setting is used as the TMENC10
count clock.
The UDC mode is further divided into two modes according to the TMENC10 clear conditions.
• UDC mode A (TUM10 register’s CMD bit = 1, MSEL bit = 0)
The TMENC10 clear source can be selected as external clear input (TCLR1), the internal signal
indicating a match between the TMENC10 count value and the CM100 set value during an up
count operation, or the logical sum (OR) of the two signals, using the CLR1 and CLR0 bits of the
TMC10 register.
TMENC10 can transfer (reload) the value of CM100 upon occurrence of TMENC10 underflow,
when the RLEN bit of the TMC10 register is set (1).
• UDC mode B (TUM10 register’s CMD bit = 1, MSEL bit = 1)
The status of TMENC10 after a match of the TMENC10 count value and CM100 set value is as
follows.
<1> In case of an up count operation, TMENC10 is cleared (0000H), and the INTCM10 interrupt
is generated.
<2> In case of a down count operation, the TMENC10 count value is decremented (-1).
The status of TMENC10 after a match of the TMENC10 count value and CM101 set value is as
follows.
<1> In case of an up count operation, the TMENC10 count value is incremented (+1).
<2> In case of a down count operation, TMENC10 is cleared (0000H), and the INTCM11
interrupt is generated.
Содержание MuPD70F3187
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