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參數(shù)資料
| 型號： | HE84G770B |
| 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 |
| 文件頁數(shù)： | 42/61頁 |
| 文件大?。?/td> | 817K |
| 代理商： | HE84G770B |
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King Billion Electronics Co., Ltd
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HE84G770
HE80004H SERIES
October 31, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
42
Version:V1.1
Bit
Name Value
Function description
PWM Output Driver Enable
PWM Output Driver Disable
PWM Module Enable
PWM Module Disable
Digital-to-Analog Converter Enable
Digital-to-Analog Converter Disable
DAC output to DAO pin
DAC output to VO pin
1
0
1
0
1
0
1
0
VOC[3]
PWME
VOC[2]
PWM
VOC[1]
DAC
VOC[0]
OP
The pulse-width modulator (PWM) converts 8-bit unsigned speech data which is written into PWMC data
register to proportional duty cycle of PWM output. PWM module shares the same digital input register
PWMC 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 value of PWMC register.
DA = 0x20
DA = 0x80
DA = 0xE0
1 subframe
The PWM bit of VOC controls the enable/disable of the PWM circuit and output driver. When PWM bit
of VOC is ‘0’, PWME bit and output drivers are both cleared. To use PWM as 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 VOC 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[6:0] to ”0000000”. 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 VOC[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
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