參數(shù)資料
型號： M37281EKSP
廠商： Renesas Technology Corp.
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微機隱蔽字幕解碼器和屏幕顯示控制器
文件頁數(shù)： 30/172頁
文件大?。?/td> 1319K
代理商： M37281EKSP
M37281MAH
–
XXXSP,M37281MFH
–
XXXSP,M37281MKH
–
XXXSP, M37281EKSP
Rev.1.01 2003.07.16 page 30 of 170
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
), and data output pin (S
OUT
) also function
as port P4, data input pin (S
IN
) also functions as ports P1 and P7.
Bit 2 of the serial I/O mode register (address 0213
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 8, 16, 32, or 64. To use the
pin for servial I/O, set the bit corresponding to S
CLK
pin of thr port
P4 direction register (address 00C9
16
) and the bit corresponding
to S
IN
pin of the port P1 direction register (address 00C3
16
) to
“
0
”
.
Fig. 8.5.1 Serial I/O Block Diagram
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
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
More over, set the bit corresponding to S
OUT
of rhe port P4 direction
register (address 00C9
16
) to
“
1
”
And, to use S
OUT
pin for serial I/O,
set the corresponding bits of the port P4 direction register (address
00C9
16
) to
“
1.
”
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.
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參數(shù)描述
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M37281MAH-XXXSP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M37281MFH-XXXSP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M37281MKH-XXXSP 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
M372899234 制造商:ITW Switches 功能描述:IN-RUSH
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