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參數(shù)資料
| 型號(hào)： | M37224M3-XXXSP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, 1.778 MM PITCH, SHRINK, PLASTIC, DIP-42 |
| 文件頁(yè)數(shù)： | 14/83頁(yè) |
| 文件大小： | 901K |
| 代理商： | M37224M3-XXXSP |
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M37224M3-XXXSP
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
21
SERIAL I/O
The M37224M3-XXXSP has a built-in serial I/O which can either trans-
mit or receive 8-bit data serially in the clock synchronous mode.
The serial I/O block diagram is shown in Figure 18. The synchronous
clock I/O pin (SCLK), and data I/O pins (SOUT, SIN) also function as
port P2.
Bit 2 of the serial I/O mode register (address 00DC16) selects whether
the synchronous clock is supplied internally or externally (from the
P20/SCLK pin). When an internal clock is selected, bits 1 and 0 select
whether f(XIN) is divided by 4, 16, 32, or 64. Bit 3 selects whether
port P2 is used for serial I/O or not. To use the P22/SIN pin as the SIN
pin, set the bit 2 of the port P2 direction register (address 00C516) to
“0.”
The operation of the serial I/O is described below. The operation
differs depending on the clock source; external clock or internal
clock.
Fig. 18. Serial I/O Block Diagram
8
Serial I/O shift register (8)
Data bus
Serial I/O interrupt
request
Selection gate :
Connected to black
side at reset.
Synchronous circuit
Frequency
divider
1/8
1/4
1/16
SM1
SM0
Serial I/O counter (8)
SM5: LSB
MSB
S
SM2
1/2
SM6
XIN
SIN
SOUT
SCLK
1/2
SM3
P21 latch
P20 latch
SM3
(Address 00DD16)
SM : Serial I/O mode register
Note: When the data is set in the serial I/O register (address 00DD 16), the register functions as the serial I/O shift register.
(Note)
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