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參數(shù)資料
| 型號(hào)： | S1C621C0D |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 1.3 MHz, MICROCONTROLLER, UUC74 |
| 封裝： | DIE-74 |
| 文件頁(yè)數(shù)： | 37/108頁(yè) |
| 文件大小： | 992K |
| 代理商： | S1C621C0D |
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26
EPSON
S1C621C0 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
BZFQ: BZ frequency selection register (C4HD0)
Selects the frequency of the BZ signal.
When "1" is written:
4,096 Hz
When "0" is written:
2,048 Hz
Reading:
Valid
Select the frequency of the BZ signal when the R03 port is set to BZ output. By writing "1" to BZFQ, the
frequency of the BZ signal is set to 4,096 Hz. When "0" is written, it is set to 2,048 Hz.
At initial reset, this register is set to "0".
4.5.5 Programming notes
(1) When R00–R03 are used as DC output, the special output enable registers REMCR (R00), REMDC (R01),
FOUTE (R02) and BZE (R03) should be fixed at "0".
(2) When the special output is selected, the corresponding output port register (R00–R03) should be fixed
at "0". Be aware that the output terminal is fixed at a high (VDD) level the same with the DC output if "1"
is written to the R00–R03 register when the special output has been selected.
(3) When BZ and FOUT are selected, a hazard may be observed in the output waveform when the data of
the output register changes.
(4) When selecting fOSC3 as the FOUT clock frequency, it is necessary to control the OSC3 oscillation circuit.
See Section 4.3, "Oscillation Circuit" for details of the control.
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