參數(shù)資料
型號: MC68HC05E6VFB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 92/140頁
文件大?。?/td> 1141K
代理商: MC68HC05E6VFB
Programmable Timer
Timer functions
MC68HC05E6 — Rev. 1.0
MOTOROLA
Programmable Timer
55
5-ptimer
internal bus clock cycles. TOF is set when the counter overflows (from
$FFFF to $0000); this will cause an interrupt if TOIE is set.
Bits 8 – 15 — MSB of counter/alternate counter register
A read of only the more significant byte (MSB) transfers the LSB to a
buffer, which remains fixed after the first MSB read, until the LSB is also
read.
Bits 0 – 7 — LSB of counter/alternate counter register
A read of only the less significant byte (LSB) receives the count value at
the time of reading.
Timer functions
The 16-bit programmable timer is monitored and controlled by a group
of ten registers, full details of which are contained in the following
paragraphs. An explanation of the timer functions is also given.
Timer control
register TCR
The timer control register at location $12 is used to enable the input
capture (ICIE), output compare (OCIE), and timer overflow (TOIE)
interrupt enable functions as well as selecting input edge sensitivity
(IEDG) and output level polarity (OLV).
ICIE — Input capture interrupt enable
1 = Input capture interrupt enabled.
0 = Input capture interrupt disabled.
OCIE — Output compare interrupt enable
1 = Output compare interrupt enabled.
0 = Output compare interrupt disabled.
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Timer control (TCR)
$0012
ICIE
OCIE
TOIE
0
IEDG
OLV 0000 00u0
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