參數(shù)資料
型號: M37274MA-084SP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
中文描述: 單芯片8位CMOS微機(jī)隱蔽字幕解碼器和屏幕顯示控制器
文件頁數(shù): 25/147頁
文件大?。?/td> 2042K
代理商: M37274MA-084SP
25
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274EFSP
PRELIMINARY
Notice: This is not a final specification.
Some paramentic limits are subject to change.
MITSUBISHI MICROCOMPUTERS
SERIAL I/O
The M37274EFSP 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 19. The synchronous
clock I/O pin (S
CLK
), and data output pin (S
OUT
) also function as port
P4, data input pin (S
IN
) also functions as port P1.
Bit 2 of the serial I/O mode register (address 0213
16
) selects whether
the synchronous clock is supplied internally or externally (from the
P4
6
/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 8, 16, 32, or 64. To use S
OUT
and P4
6
/S
CLK
pins for serial I/O, set the corresponding bits of the
port P4 direction register (address 00C9
16
) to “0.” To use S
IN
pin for
serial I/O, set the corresponding bit of the port P1 direction register
(address 00C3
16
) to “0.”
Fig. 19. 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: Connect 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
X
IN
S
IN
S
OUT
S
CLK
1/2
(Address 0214
16
)
X
CIN
1/2
CM7
1/2
Note :
When the data is set in the serial I/O register (address 0214
16
), the register functions as the serial I/O shift register.
(Note)
CM : CPU mode register
SM : Serial I/O mode register
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