MC68HC705KJ1 Datasheet, PDF (80/108 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Multifunction Timer Module
OVERFLOW
RESET
TIMER COUNTER REGISTER
BITS [0:7] OF 15-STAGE
RIPPLE COUNTER
RESET
÷ 4 ^{INTERNAL CLOCK}
(XTAL ÷ 2)
INTERRUPT
REQUEST
TIMER STATUS/CONTROL REGISTER
RTI RATE SELECT
RESET
÷2
÷2
÷2
÷2
÷2
÷2
÷2
BITS [8:14] OF 15-STAGE RIPPLE COUNTER
÷8
SQ
COP RESET
RESET
R
Figure 9-2. Multifunction Timer Block Diagram
9.4 Interrupts
The following timer sources can generate interrupts:
• Timer overflow flag (TOF) — The TOF bit is set when the first eight stages of the counter roll over
from $FF to $00. The timer overflow interrupt enable bit, TOIE, enables TOF interrupt requests.
• Real-time interrupt flag (RTIF) — The RTIF bit is set when the selected RTI output becomes active.
The real-time interrupt enable bit, RTIE, enables RTIF interrupt requests.
MC68HC705KJ1 • MC68HRC705KJ1 • MC68HLC705KJ1 Data Sheet, Rev. 4.1
80
Freescale Semiconductor