參數(shù)資料
型號: MC68HC11D3CFB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 2 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 5/131頁
文件大?。?/td> 1640K
代理商: MC68HC11D3CFB
MOTOROLA
TIMING SYSTEM
MC68HC11D3
9-16
TECHNICAL DATA
Figure 9-3 Pulse Accumulator
Pulse accumulator control bits are also located within two timer registers, TMSK2 and
TFLG2, as described in the following paragraphs.
Table 9-3 Pulse Accumulator Timing
Common XTAL Frequencies
Selected Crystal
4.0 MHz
8.0 MHz
12.0 MHz
CPU Clock
(E)
1.0 MHz
2.0 MHz
3.0 MHz
Cycle Time
(1/E)
1000 ns
500 ns
333 ns
Pulse Accumulator (in Gated Mode)
(E/26)
(E/214)
1 count -
overflow -
64.0 s
16.384 ms
32.0 s
8.192 ms
21.33 s
5.461 ms
PACNT
8-BIT COUNTER
2:1
MUX
PA7/
ENABLE
OVERFLOW
1
2
INTERRUPT
REQUESTS
INTERNAL
DATA BUS
INPUT BUFFER
&
EDGE DETECTION
PACTL
TFLG2
TMSK2
PA
O
V
I
PA
II
DDRA7
PAEN
PAM
O
D
PEDG
E
PA
O
V
F
PA
IF
11 PULSE ACC BLOCK
OUTPUT
BUFFER
PAI EDGE
PAEN
E ÷ 64 CLOCK
(FROM MAIN TIMER)
PAI/OC1
FROM
MAIN TIMER
OC1
DISABLE
FLAG SETTING
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