MC68HC08LT8 Datasheet, PDF (72/156 Pages) Freescale Semiconductor, Inc – Microcontrollers

Programmable Periodic Interrupt (PPI)
PPIECK
32KXCLK
PPI1CLKS[1:0]
SEL
OE
COUNTER
CLK
OV
CLR
SEL
ONE SHOT
RST
V_DD
DQ
E
R
SYNCHRONIZER
PPI1MSK
PPI1L
PPI1
INTERRUPT
REQUEST
RESET
PPI1L
VECTOR
FETCH
DECODER
PPI1IE2 PPI1IE1 PPI1IE0
INTERNAL ADDRESS BUS
Figure 7-1. Programmable Periodic Interrupt Block Diagram
7.4 I/O Pins
The external clock input option of the PPI is from the PPIECK pin and is selected by the clock select bits,
PPI1CLKS[1:0]. The maximum PPIECK frequency is four times the bus frequency.
7.5 Low-Power Modes
The PPI module remains active (crystal clock source is not affected if crystal clock is enabled in stop
mode; counter can count and can generate interrupts) in wait and stop mode if proper clocking source is
supplied.
MC68HC08LT8 Data Sheet, Rev. 1
72
Freescale Semiconductor