MC68HC05F8 Datasheet, PDF (59/126 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
MC68HC05F8 INTERNAL BUS
INTERNAL
PROCESSOR
CLOCK
TCSB1
TCSB0
÷ 4 / 8 / 16 / 32
8 BIT
BUFFER
ACTIVE
LOGIC
16 BIT FREE
RUNNING
COUNTER
16 BIT TIMER
PRESET
REGISTER
6
LOAD
COUNTER
ALTERNATE
REGISTER
UNDERFLOW
DETECT
CRCUIT
TCSB1 TCSB0 TMBE TBOIE TUF
TIMER B CONTROL REGISTER
TIMER B INTERRUPT
Figure 6-6 Reloadable Timer Block Diagram
6.2.3 Timer B Counter
– Timer B Counter
– Timer B Alternate Counter
High byte - $25, Low byte - $26
High byte - $27, Low byte - $28
The double-byte, reloadable timer counter can be read from either of two locations, $25 & $26
(Timer B counter register) or $27 & $28 (Timer B counter alternate register). Reading only the
least significant byte (LSB) of the free-running counter ($26 or $28) receives the count value at
MC68HC05F8
TIMERS
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TPG
MOTOROLA
6-11