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參數(shù)資料
| 型號： | M34502M4-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, MICROCONTROLLER, PDSO24 |
| 封裝： | 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 33/96頁 |
| 文件大小： | 958K |
| 代理商： | M34502M4-XXXFP |
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39
Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
1.18.2 SIO Normal Operation
An internal clock or an external clock can be selected
as the synchronous clock. When the internal clock is
chosen, dividers are built in to provide eight different
clock selections. The start of a transfer is initiated by
a write signal to the SIO shift register (address
002A16). The SRDY signal then drops active low. On
the negative edge of the transfer clock SRDY returns
high and the data is transmitted out the STXD pin.
Data is latched in from the SRXD pin on the rising
edge of the transfer clock. If an internal clock is se-
lected, the STXD pin enters a high-impedance state
after an 8-bit transfer is completed. If an external
clock is selected, the contents of the serial I/O regis-
ter continue to be shifted while the send/receive clock
is being input. Therefore, the clock needs to be con-
trolled by the external source. Also there is no STXD
high-impedance function after data is transferred.
Regardless of whether an internal or external clock is
selected, after an 8-bit transfer, the interrupt request
bit is set. Figure 1.39 shows the timing for the serial I/
O with the LSB-first option selected.
Synchronous Clock
Transfer Clock
SIO Register
Receive Enable
SIO Output
SIO Input
Write Signal
Signal SRDY
Interrupt Request Bit Set
See Note
Note:
When the internal clock is selected, the TxD pin goes into high-
impedance after the data is transferred.
D0 D1 D2 D3 D4 D5 D6 D7
Fig. 1.39. Normal Mode SIO Function Timing (with LSB-First selected)
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| M34506E4 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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| M34506M2-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES |
| M34506M4 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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