MC68L300 Datasheet, PDF (26/32 Pages) Freescale Semiconductor, Inc – 16.78 MHz Electrical Characteristics

Freescale Semiconductor, Inc.
PHI1^*
PHI1^*/4
EXT PIN (PAI)
TCNT
$FFFE
$FFFF
$0000
PACNT
$77
$78
NOTE: 1. TCNT counts as a result of PHI1*/4; PACNT counts when TCNT overflows from $FFFF to $0000 and the
conditioned PAI signal is asserted.
2. ^*PHI1 has the same frequency as the system clock; however, it does not have the same timing.
Figure 24 Pulse Accumulator — Using TOF as Gated Mode Clock
PHI1^*
PHI1^*/2
PWMCNT (7:0)
$FF
$00
$01
$02
EXT PIN (PMWx)
NOTE: 1. ^*PAI1 is the same frequency as the system clock; however, it does not have the same timing.
2. When the counter rolls over from $FF to $00, the PWM pin is set to logic level one.
3. When the counter equals the PWM register, the PWM pin is cleared to a logic level zero.
Figure 25 PWMx (PWMx Register = 01, Fast Mode)
26
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MC68L300EC16/D