CMS32L051 User Manual |Chapter 5 Universal Timer Unit (Timer4)
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5.4.2 Basic rules for the 8-bit timer to operate the function (limited to Channel 1 and Channel 3
of Unit 0).
The 8-bit timer operation function is the function of using the channel of the 16-bit timer as the channel of
two 8-bit timers.
Only Channel 1 and Channel 3 can use the 8-bit timer operation function, and there are several rules to
be observed when using.
The basic rules for the 8-bit timer to run the function are as follows.
1) The 8-bit timer operation function is only available for Channel 1 and Channel 3.
2) When used as an 8-bit timer, the SPLIT position of the timer mode register mn (TMRmn) is 1.
3) The high 8-bit timer can be used as an interval timer function.
4) At the beginning of operation, the high 8-bit timer outputs INTTMm1H/INTTMm3H (interrupt) (the
same as the operation of MDmn0 bit 1).
5) The choice of operating clock for a high 8-bit timer depends on the setting of the CKSmn1 bit and
CKSmn0 bits of the low-bit TMRmn register.
6) For the high 8-bit timer, the operation of the channel is started by operating the TSHm1/TSHm3 bits,
and the operation of the channel is stopped by operating the TTHm1/TTHm3 bits. The status of the
channel can be confirmed by the TEHm1/TEHm3 bits.
7) The operation of the low 8-bit timer depends on the setting of the TMRmn register, and there are
three functions that support the operation of the low 8-bit timer:
Interval timer function
External event counter function
Delay counting function
8) For the low 8-bit timer, the operation of the channel is started by operating the TSm1/TSm3 bits, and
the operation of the channel is stopped by operating the TTm1/TTm3 bits. The status of the channel
can be confirmed by the TEm1/TEm3 bits.
9) The operation of the TSHm1/TSHm3/TTHm1/TTHm3 bits is invalid when the 16-bit timer is running.
Channel 1 and Channel 3 operate by operating the TSm1/TSm3 bits and the TTm1/TTm3 bits.
TEHm3 bits and TEHm1 bits are unchanged.
10) The 8-bit timer function cannot use the linkage operation function (single trigger pulse, PWM, and
multiple PWM).
Remarks m: Unit number (m=0) n: Channel number (n=1, 3).
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