Cmsemicon CMS32L051 - Registers for Controlling Timer Input;Output Pin Port Functions

V1.2.2
CMS32L051 User Manual |Chapter 5 Universal Timer Unit (Timer4)
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5.3.15 Registers for controlling timer input/output pin port functions
When using a general-purpose timer unit, the input/output pins of timer 0 are multiplexed to a fixed
port, and the input/output pins of timer 1 can be arbitrarily configured to ports except RESETB. For details,
please refer to Chapter 2 Pin Functions.
When multiplexing the output pin of Timer 0 to a port, the bit of Port Mode Control Register (PMCxx),
the bit of Port Mode Register (PMxx), and the bit of Port Register (Pxx) corresponding to the port must be
set to 0.
When using the multiplexed port of the timer 0 input pin as the input to the timer, the port must
correspond to position 0 of the port mode control register (PMCxx) and 1 of the port mode register
(PMxx).
When using the multiplexed port of timer 0 input pin as timer input, the corresponding bit of the port
mode control register (PMCxx) must be set to 0 and the bit of the port mode register (PMxx) must be
set to 1.
Example: P21 is configured to TO10 as the timer output
Set the PMC21 bit of the port mode control register 2 to 0.
Set the PM21 bit of the port mode register 2 to 0.
Set the port output multiplexing function configuration register P21 CFG to 0x01.
When using the multiplexed port of Timer 1 input pin as timer input, the bit of Port Mode Register
(PMxx) corresponding to each port must be set to 1 and the bit of Port Mode Control Register (PMCxx)
must be set to 0. And set the port multiplexing function configuration register (TI10PCFG). At this point,
the port register (Pxx) bit can be 0 or 1.
Example: P20 / TI10 is used as the timer input
Set the PMC20 bit of Port Mode Control Register 2 to 0.
Set the PM20 bit of Port Mode Register 2 to 1.
Set the port input multiplexing function configuration register TI10PCFG to 0x0b.