MC9S08QG8_09 Datasheet, PDF (183/314 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Chapter 13
Modulo Timer (S08MTIMV1)
13.1 Introduction
The MTIM is a simple 8-bit timer with several software selectable clock sources and a programmable
interrupt.
The central component of the MTIM is the 8-bit counter, which can operate as a free-running counter or a
modulo counter. A timer overflow interrupt can be enabled to generate periodic interrupts for time-based
software loops.
Figure 13-1 shows the MC9S08QG8/4 block diagram with the MTIM highlighted.
13.1.1 MTIM/TPM Configuration Information
The external clock for the MTIM module, TCLK, is selected by setting CLKS = 1:1 or 1:0 in MTIMCLK,
which selects the TCLK pin input. The TCLK input on PTA5 can be enabled as external clock inputs to
both the MTIM and TPM modules simultaneously.
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 5
Freescale Semiconductor
181