參數(shù)資料
型號(hào)： HE84761
廠商： King Billion Electronics Co., Ltd.
英文描述： 8-bit Micro-controller
中文描述： 8位微控制器
文件頁(yè)數(shù)： 24/30頁(yè)
文件大?。?/td> 456K
代理商： HE84761
King Billion Electronics Co., Ltd
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HE84761
HE80000 SERIES
The output current of the DAC is programmable by mask option MO_DACISEL:
August 15, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
Page 24 of 30
V1.2
MO_DACISEL[1:0] DAC output current
00
01
10
11
0.375 mA
0.75 mA
1.5 mA
3 mA
16.
Pulse-Width Modulation
The pulse-width modulator (PWM) converts 7-bit unsigned speech data written to PWMC data register to
proportional duty cycle of PWM output. PWM module shares the PWMC data register with
Digit-to-Analog Converter. So PWM and DA output can exist at the same time. When PWM circuit is
enabled, it generates signal with duty ratio in proportion to the DA value.
DA = 0x20
DA = 0x80
DA = 0xE0
1 subframe
The PWM bit of VOC register controls register to enable the circuit and output driver. When PWM bit of
VOC is ‘0’, PWME bit and output drivers settings are both cleared. To use PWM for voice output, PWM
bit has to be set to ‘1’ first, then set PWME bit and enable output driver by setting the driver number. If
PWM bit is disabled and enabled again, the setting for driver and PWME bit will be clear.
The Fast Clock is gated through PWME bit of PWMC command register to provide the clock source of
PWM circuit when it is enabled. As PWM needs higher frequency to operate, it cannot generate correct
PWM signal in Slow clock only mode.
When the program enters into Sleep mode or Idle mode, it will automatically turn off all voice outputs by
clearing VOC[2:1] to ”00”. To activate voice output again when returning to Normal Mode, the VOC
register needs to be set again.
The PWM output volume can be adjusted by command register PWMC[6:4]. The bit 6 and 5 control 2
time driver, while bit 4 controls 1 time driver, thus it has 5 levels of driver output. By turning on/off the
internal drivers, the sound level of PWM output can be turned up and down. Please note that this
adjustment apply only to PWM, but not DA output.
PWM output driver selection
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