XC68HC705F32 Motorola, XC68HC705F32 Datasheet - Page 53

• Manufacturer Part Number: XC68HC705F32
• Description: MICROCONTROLLER
• Manufacturer: Motorola

The MC68HC05F32 has a 15-stage ripple counter called the core timer (CTIMER). Features of
this timer are: timer overflow, power-on reset (POR), real time interrupt (RTI) with four selectable
interrupt rates and a computer operating properly (COP) watchdog timer.
MC68HC05F32
8
8
Overflow
detect
circuit
TOF
f
OP
To interrupt logic
Interrupt circuit
RTIF TOFE
/ 2
10
(Core timer control and status)
Figure 5-1 Core timer block diagram
(Core timer counter)
f
RTIE
OP
$08 CTCSR
$09 CTCR
CORE TIMER
/ 2
17
RTOF RRTIF RT1
CORE TIMER
RTI select circuit
Internal bus
5
7-bit counter
RT0
8
f
OP
/ 2
f
OP
14
Internal processor clock
/ 2
2
COP watchdog
( 4)
f
OP
timer
( 8)
reset
logic
To
MOTOROLA
COP
clear
TPG
5-1
5