Microcontroller User's Manual

MOTOROLA Chapter 20. General Purpose Timer Modules (GPTA and GPTB) 20-3
Low-Power Mode Operation
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.
Table 20-1. Watchdog Module Operation in Low-power Modes
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.
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
GPTn0PORTTn0GPTn channel 0 IC/OC pin Input Active
GPTn1PORTTn1GPTn channel 1 IC/OC pin Input Active
GPTn2PORTTn2GPTn channel 2 IC/OC pin Input Active
GPTn3PORTTn3GPTn 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