Mtim16 In Active Background Mode; External Signal Description; Tclk - External Clock Source Input Into Mtim16 - NXP Semiconductors MC9S08SU16 Reference Manual

External Signal Description

• If the device exits any of these modes with an interrupt, the MTIM module continues
from its state in the low-power stop mode.
• If the counter was active upon entering any of these modes, the count resumes from
the current value.

13.3.2.3 MTIM16 in Active Background Mode

The MTIM16 stops all counting until the microcontroller returns to normal user operating
mode. Counting resumes from the suspended value as long as an MTIM16 reset did not
occur (TRST written to a 1).
13.4 External Signal Description
This section describes the module external signals.
13.4.1 TCLK — External Clock Source Input into MTIM16
The MTIM16 includes one external signal, TCLK, used to input an external clock when
selected as the MTIM16 clock source. The signal properties of TCLK are shown in the
following table.
Signal Function
TCLK External clock source input into MTIM16
The TCLK input must be synchronized by the bus clock. Also, variations in duty cycle
and clock jitter must be accommodated. As a result, the TCLK signal must be limited to
one-fourth of the bus frequency.
The TCLK pin can be muxed with a general-purpose port pin. Refer to the chip-level
signal multiplexing and pin assignment details for more information.
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Table 13-2. Signal Properties
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
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NXP Semiconductors