Extclk — Ftm External Clock - NXP Semiconductors MC9S08SU16 Reference Manual

Name Function
EXTCLK External clock – FTM external clock can be selected to drive the FTM counter.
1
CHn Channel (n) – I/O pin associated with FTM channel (n).
1. n = channel number (0 to 7)
19.3.1 EXTCLK — FTM external clock
The external clock input signal is used as the FTM counter clock if selected by
CLKS[1:0] bits in the SC register. This clock signal must not exceed 1/4 of system clock
frequency. The FTM counter prescaler selection and settings are also used when an
external clock is selected.
19.3.2 CHn — FTM channel (n) I/O pin
Each FTM channel can be configured to operate either as input or output. The direction
associated with each channel, input or output, is selected according to the mode assigned
for that channel.
19.4 Memory map and register definition
This section provides a detailed description of all FTM registers.
19.4.1 Module memory map
This section presents a high-level summary of the FTM registers and how they are
mapped.
19.4.2 Register descriptions
This section consists of register descriptions in address order.
NXP Semiconductors
Table 19-2. Signal properties
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
Chapter 19 FlexTimer Module (FTM)
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