user manual

Core Timer
General Release Specification MC68HC05RC16 — Rev. 3.0
62 Core Timer MOTOROLA
Figure 8-1. Core Timer Block Diagram
COP
CLEAR
INTERNAL BUS
$09 CORE TIMER COUNTER REGISTER (CTCR)
5-BIT COUNTER
CTOF RTIF TOFE RTIE RT1
INTERRUPT CIRCUIT
$08
RTI SELECT CIRCUIT
STATUS REGISTER
RT0
TIMER CONTROL &
OVERFLOW
CIRCUIT
DETECT
COP WATCHDOG
TIMER (÷8)
TO RESET
LOGIC
8
8
RTFCTOFC
E ÷ 2
10
TCBP
CTCSR
CTCR
INTERNAL PERIPHERAL CLOCK (E)
TO INTERRUPT
LOGIC
RTI
OUT
E ÷ 2
12
POR
E ÷ 2
2
÷ 4
E ÷ 2
15
E ÷ 2
14
E ÷ 2
13
E ÷ 2
12
2
3