Motorola MC6805R Series User Manual

U1
~
Timer
Pin
Internal
ct>2
Clock
Ifosc+4)
fplN - Prescaler Input Frequency
fCIN-Counter Input Frequency
8
Timer Data Register !TOR)
8-Bit Counter
7-Bit Prescaler
Select
1-----------11 1-of-8
3
Timer Control Register Bits:
Set
TIR- Timer Interrupt Request Status
TIM - Timer Interrupt Mask
TIN - Timer Input Select
TIE- Timer External Input Enable
PSC - Prescaler Clear
PS2, PS1, PSO- Prescaler Select
Timer
Control Register ITCR)
Mask Option Register Bits:
ClK - Clock Oscillator Type
TOPT - Timer Mask/ Programmable Option
ClS - Timer Clock Source
ITIE) - (Timer External Input Enable)
SNM - Secure/Non-Secure Mode Option
P2, P1, PO- Prescaler Option
NOTES:
The TOPT bit in the mask option register selects whether the timer is software programmable via the timer control register or emulates
the mask programmable parts via the
MOR PROM byte.
The
TIE bit in the mask option register is not used if MOR TOPT = 1 (MC6805P2 emulation). It sets the intial value of TCR TIE if MOR
TOPT=O.
Figure 5-4. MC68705R5/MC68705U5 Timer Block Diagram
Timer

Motorola MC6805R Series Specifications

General

Brand	Motorola
Model	MC6805R Series
Category	Computer Hardware
Language	English