參數(shù)資料
型號(hào): MC68HC05CJ4FB
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): 91/114頁
文件大?。?/td> 361K
代理商: MC68HC05CJ4FB
GENERAL RELEASE SPECIFICATION
MOTOROLA
TIMER 1
MC68HC(7)05CJ4
11-2
Rev. 2.1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Figure 11-1. Timer 1 Block Diagram
11.2 Counter
The key element in the programmable timer is a 16-bit, free-running counter or
counter register, preceded by a prescaler that divides the internal processor clock
by four. The prescaler gives the timer a resolution of 2.0 microseconds if the
internal bus clock is 2.0 MHz. The counter is incremented during the low portion of
the internal bus clock. Software can read the counter at anytime without affecting
its value.
The double-byte, free-running counter can be read from either of two locations,
$18:$19 (counter register) or $1A:$1B (counter alternate register). A read from only
the least significant byte (LSB) of the free-running counter ($19, $1B) receives the
count value at the time of the read. If a read of the free-running counter or counter
alternate register first addresses the most significant byte (MSB) ($18, $1A), the
LSB ($19, $1B) is transferred to a buffer. This buffer value remains fixed after the
TCAP
EDGE
SELECT/
16-BIT COMPARATOR
OCRH
OCRL
16-BIT COUNTER
TCMP
÷ 4
DETECT
LOGIC
PIN
CONTROL
LOGIC
TRH
TRL
ICRH
ICRL
ICIE
TOIE
OCIE
IEDG
OLVL
ICF
OCF
TOF
TIMER OVERFLOW
INTERNAL
CLOCK
(XTAL
÷ 2)
INTERNAL
DATA BUS
TIMER
INTERRUPT
REQUEST
ATRL
ATRH
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