參數(shù)資料
型號(hào): MC68HC705E6MDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝: PLASTIC, SOIC-28
文件頁數(shù): 89/140頁
文件大小: 1141K
代理商: MC68HC705E6MDWR2
Programmable Timer
MC68HC05E6 — Rev. 1.0
52
Programmable Timer
MOTOROLA
Keyboard/timer register (KEY/TIM)
SEL1 — Timer select bit 1
1 = Port C bit 1 is configured as the TCMP pin of the programmable
timer.
0 = Port C bit 1 is configured as a standard I/O pin.
SEL0 — Timer select bit 0
1 = Port C bit 0 is configured as the TCAP pin of the programmable
timer.
0 = Port C bit 0 is configured as a standard I/O pin.
The timer has a 16-bit architecture, hence each specific functional
segment is represented by two 8-bit registers. These registers contain
the high and low byte of that functional segment. Accessing the low byte
of a specific timer function allows full control of that function; however,
an access of the high byte inhibits that specific timer function until the low
byte is also accessed.
NOTE:
The I-bit in the CCR should be set while manipulating both the high and
low byte register of a specific timer function to ensure that an interrupt
does not occur.
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 2s if the internal bus clock is 2MHz. The counter is
incremented during the low portion of the internal bus clock. Software
can read the counter at any time without affecting its value.
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Keyboard/timer (KEY/TIM)
$000A
KSF
KIE
KIRST
SEL1 SEL0 0000 0000
2-ptimer
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