Page 194 - Programming Microcontrollers in C

Timers 179

MC68HC05B6 Internal Bus

Internal
Processor
Clock 8-bit
Buffer

High Low High Low High Low High Low High Low
Byte Byte Byte Byte Byte Byte Byte Byte Byte Byte
16-bit Output Output Input Input
÷ 4 Free Running $18 Compare $16 Compare $1E Capture $14 Capture $1C
Counter $19 Register 1 $17 Register 2 $1F Register 1 $15 Register 2 $1D
Counter
Alternate
Register $1A
$1B
Internal Timer Bus
To PLM
Overflow Output Output Edge Edge TCAP2
Detect Compare Compare Detect Detect Pin
Circuit Circuit 1 Circuit 2 Circuit 1 Circuit 2
TCAP1
Pin

D TCMP2
Q Pin
C
Latch
D TCMP1
Q
Pin
Timer 7 6 5 4 3 C
Status ICF1 OCF1 TDF ICF2 OCF2 Latch
Register
$13 ICIE OCIE TOIE FOLV2 FOLV1 OLVL2 IEDG1 OLVL1 Timer
Control
Register
$12

Input Output Overflow
Capture Compare Interrupt Figure 4-2:
Interrupt Interrupt $1FF4.5
$1FF8.9 $1FF6.7 16-Bit Timer For The M68HC05B6