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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
Low-power Mode
Wait
Doze
Stop
Halted
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.
Throughout this section, an "n" in the pin name, as in "GPTn0,"
designates GPTA or GPTB.
Pin
GPTPORT
Name
Register Bit
GPTn0
PORTTn0
GPTn1
PORTTn1
GPTn2
PORTTn2
GPTn3
PORTTn3
SYNCn
PORTE[3:0]
1
SYNCA is available on either PORTE3 or PORTE1; SYNCB is available on either PORTE2 or
PORTE0.
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.
MOTOROLA
Chapter 20. General Purpose Timer Modules (GPTA and GPTB)
Watchdog Operation
Normal
Normal
Stopped
Normal
NOTE
Table 20-2. Signal Properties
Function
GPTn channel 0 IC/OC pin
GPTn channel 1 IC/OC pin
GPTn channel 2 IC/OC pin
GPTn channel 3 IC/OC or PA pin
1
GPTn counter synchronization
Low-Power Mode Operation
Mode Exit
No
No
No
No
Reset State
Pull-up
Input
Active
Input
Active
Input
Active
Input
Active
Input
Active
20-3
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