Tcu Signals And Registers - Intel 386 User Manual

10.1.1 TCU Signals and Registers

Table 10-1 and Table 10-2 lists the signals and registers associated with the TCU.
Device Pin or
Signal
Internal Signal
PSCLK Internal signal
TMRCLK0 Device pin
TMRCLK1
TMRCLK2
TMRGATE0 Device pin
TMRGATE1
TMRGATE2
TMROUT0 Device pin
TMROUT1
TMROUT2
Table 10-1. TCU Signals
Prescaled Clock:
This is one of the two possible connections for the counter's CLKIN n
signal. PSCLK is an internal signal that is a prescaled value of the
processor internal clock. The clock and power management unit
contains a programmable divider that determines the PSCLK frequency.
See "Controlling the PSCLK Frequency" on page 8-7, for information on
how to program PSCLK's frequency.
Timer Clock Input:
This is one of the two possible connections for the counter's CLKIN n
signal. You can drive a counter with an external clock source by
connecting the clock source to the counter's TMRCLK n pin.
Timer Gate Input:
This input can be connected to the counter's GATE n input to control the
counter's operation. In some of the counter's operating modes, a high
level on GATE n enables or resumes counting, while a low level disables
or suspends counting. In other modes, a rising edge on GATE n loads a
new count value.
Timer Output:
The counter's OUT n signal can be connected to this pin. The operation,
and consequently the waveform, of the output depends on the counter's
operating mode.
TIMER/COUNTER UNIT
Description
10-3