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參數(shù)資料
| 型號： | M37212M8-XXXSP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER |
| 中文描述： | 單芯片8位CMOS微機電壓合成 |
| 文件頁數(shù)： | 27/119頁 |
| 文件大小： | 1308K |
| 代理商： | M37212M8-XXXSP |
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27
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
M37212EFSP/FP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
8.5 SERIAL I/O
This microcomputer has a built-in serial I/O which can either transmit
or receive 8-bit data serially in the clock synchronous mode.
The serial I/O block diagram is shown in Figure 8.5.1. The synchro-
nous clock I/O pin (S
CLK
), data output pin (S
OUT
), and data input pin
(S
IN
) also functions as port P4.
Bit 3 of the serial I/O mode register (address 00DC
16
) selects whether
the synchronous clock is supplied internally or externally (from the
S
CLK
pin). When an internal clock is selected, bits 1 and 0 select
whether f(X
IN
) or f(X
CIN
) is divided by 4, 16, 32, or 64. To use S
IN
pin
for serial I/O, set the corresponding bit of the port P2 direction regis-
ter (address 00C5
16
) to “0.”
Fig. 8.5.1 Serial I/O Block Diagram
The operation of the serial I/O is described below. The operation of
the serial I/O differs depending on the clock source; external clock or
internal clock.
8
Serial I/O shift register (8)
Data bus
Serial I/O interrupt
request
Selection gate :
Connected to black
colored side at reset.
SM : Serial I/O mode register
Synchronization circuit
Frequency
divider
1/4
1/8
1/16
SM1
SM0
Serial I/O counter (8)
SM5
: LSB
MSB
S
SM2
1/2
SM6
X
IN
S
IN
S
OUT(/IN)
S
CLK
1/2
SM3
P4
0
latch
P4
1
latch
SM3
(Address 00DD
16
)
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.
(See note)
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