Motorola ColdFire MCF5281 - Manual (Page 371)

General Purpose Timer Modules (GPTA and GPTB)
Freescale Semiconductor 20-3
20.3 Low-Power Mode Operation
This subsection describes the operation of the general purpose time module in low-power modes and
halted mode of operation. Low-power modes are described in the Power Management Module. Table 3-1
shows the general purpose timer module operation in the low-power modes, and shows how this module
may facilitate exit from each mode.
General purpose timer operation stops in stop mode. When stop mode is exited, the general purpose timer
continues to operate in its pre-stop mode state.
20.4 Signal Description
Table 20-2 provides an overview of the signal properties.
NOTE
Throughout this section, an “n” in the pin name, as in “GPTn0,” designates
GPTA or GPTB.
20.4.1 GPTn[2:0]
The GPTn[2:0] pins are for channel 2–0 input capture and output compare functions. These pins are
available for general-purpose input/output (I/O) when not configured for timer functions.
20.4.2 GPTn3
The GPTn3 pin is for channel 3 input capture and output compare functions or for the pulse accumulator
input. This pin is available for general-purpose I/O when not configured for timer functions.
Table 20-1. Watchdog Module Operation in Low-power Modes
Low-power Mode Watchdog Operation Mode Exit
Wait Normal No
Doze Normal No
Stop Stopped No
Halted Normal No
Table 20-2. Signal Properties
Pin
Name
GPTPORT
Register Bit
Function Reset State Pull-up
GPTn0 PORTTn0 GPTn channel 0 IC/OC pin Input Active
GPTn1 PORTTn1 GPTn channel 1 IC/OC pin Input Active
GPTn2 PORTTn2 GPTn channel 2 IC/OC pin Input Active
GPTn3 PORTTn3 GPTn channel 3 IC/OC or PA pin Input Active
SYNCn PORTE[3:0] 1
1
SYNCA is available on either PORTE3 or PORTE1; SYNCB is available on either PORTE2 or
PORTE0.
GPTn counter synchronization Input Active
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3