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参数资料
| 型号： | M34238MK-XXXGP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | PLASTIC, SOP-20 |
| 文件页数： | 41/41页 |
| 文件大小： | 243K |
| 代理商： | M34238MK-XXXGP |
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MITSUBISHI MICROCOMPUTERS
4238 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
8
CARRIER WAVE SELECT REGISTER C
Carrier wave select register C is a 3-bit (C2 – C0) register to select
waveform of carrier wave output from port CARR. The TCA instruc-
tion can be used to transfer the contents of bits 2 to 0 (A2 – A0) of
register A to register C. The TAC instruction can be used to transfer
the contents of register C to A2 – A0. In this time, “0” is stored in the
bit 3 (A3) of register A certainly.
When the TCA instruction is executed, port CARR output latch is
cleared to “0” and “L” level is output from port CARR.
Figure 12 shows the relationship between the setting value of carrier
wave select register C and the selected waveform.
Fig. 12 Relationship between the setting value of carrier wave select register C and the output waveform
Setting value
of register C
C2
C1
C0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
LA
OCRA
(TCA)
OCRA
8LA
0
Output wavefom
Carrier wave
Frequency
f(XIN)/12
[f(XIN)/96]
f(XIN)/8
[f(XIN)/64]
f(XIN)
[f(XIN)/8]
Duty
1/3
1/2
1/4
1/2
No carrier wave
“L”level fixed
Note: Frequency is the value at instruction clock = f(XIN)/4
Enclosed in parenthesis is the value at instruction clock = f(XIN)/32
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