參數(shù)資料
型號(hào): MC68HC11K4VFU4
廠商: MOTOROLA INC
元件分類(lèi): 微控制器/微處理器
英文描述: Technical Summary 8-Bit Microcontroller
中文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁(yè)數(shù): 71/80頁(yè)
文件大小: 420K
代理商: MC68HC11K4VFU4
M68HC11 K Series
MC68HC11KTS/D
MOTOROLA
71
11 Pulse Accumulator
M68HC11 K-series MCUs have an 8-bit counter that can be configured as a simple event counter or for
gated time accumulation. The counter can be read or written at any time.
The port A bit 7 I/O pin can be configured to act as a clock in event counting mode, or as a gate signal
to enable a free-running clock (E divided by 64) to the 8-bit counter in gated time accumulation mode.
Figure 18 Pulse Accumulator System Block Diagram
Common XTAL Frequencies
12.0 MHz
3.0 MHz
333 ns
8.0 MHz
2.0 MHz
500 ns
16.0 MHz
4.0 MHz
250 ns
CPU Clock
Cycle Time
(E)
(1/E)
Pulse Accumulator (Gated Mode)
32.0
μ
s
8.192 ms
1 Count —
(2
6
/E)
(2
14
/E)
21.33
μ
s
5.461 ms
16.0
μ
s
4.096 ms
Overflow —
P
P
P
PACTL
CONTROL
INTERNAL
DATA BUS
PACNT
8-BIT COUNTER
PA7/
PAI/
OC1
INTERRUPT
REQUESTS
P
P
TFLG2
INTERRUPT STATUS
P
P
PAOVF
PAOVI
PAIF
PAII
TMSK2
INT ENABLES
1
2
OVERFLOW
ENABLE
DISABLE
FLAG SETTING
CLOCK
PAI EDGE
PAEN
PAEN
2:1
MUX
OUTPUT
BUFFER
INPUT BUFFER
AND
EDGE DETECTOR
FROM
MAIN TIMER
OC1
DATA BUS
PIN
E
÷
64 CLOCK
(FROM MAIN TIMER)
FROM
DDRA7
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