參數(shù)資料
型號: 68HC705BD7
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 48/85頁
文件大?。?/td> 302K
代理商: 68HC705BD7
MOTOROLA
Page 38
SECTION 8: PULSE WIDTH MODULATION
GENERAL RELEASE SPECIFICATION
MC68HC05BD7 Rev. 2.0
PRELMNARY
Figure 8-2: Relationship Between 5-Bit PWM and 3-Bit BRM
8.2
Open-Drain Option Register
This PWM Open-Drain option Register contains 8 bits which are programmed to change
the output drive of individual PWM channel from channel 0 to channel 7 to be open-drain
type. This register is located at $0012
Figure 8-3: PWM Open-Drain Option Register
When any bit in this register is one, the corresponding PWM channel output becomes +5V
open-drain type. When the bit is zero, the corresponding PWM channel has push-pull
output. All eight bits are clear upon reset.
32 T
M = $00
M = $01
M = $0F
M = $1F
Narrow pulse possibly inserted
by the BRM
T = 1 MCU Clock Period (0.5
μ
s if MCU clock = 2 MHz)
PWM cycles in which narrow pulses are
inserted in an 8-cycle frame
4
2, 6
1, 3, 5, 7
XX1
X1X
1XX
0
7
1PWMO
2PWMO
3PWMO
0
0
0
0
0
0
0
6
5
4
3
2
1
0
W
R
PWMOR
$12
reset
0PWMO
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