參數(shù)資料
型號(hào): M37281EKSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP52
封裝: PLASTIC, SHRINK, DIP-52
文件頁數(shù): 83/158頁
文件大?。?/td> 1472K
代理商: M37281EKSP
30
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37281MAH–XXXSP,M37281MFH–XXXSP
M37281MKH–XXXSP,M37281EKSP
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 (SCLK), and data output pin (SOUT) also function
as port P4, data input pin (SIN) also functions as ports P1 and P7.
Bit 2 of the serial I/O mode register (address 021316) selects whether
the synchronous clock is supplied internally or externally (from the
SCLK pin). When an internal clock is selected, bits 1 and 0 select
whether f(XIN) or f(XCIN) is divided by 8, 16, 32, or 64. To use the
pin for servial I/O, set the bit corresponding to SCLK pin of thr port
P4 direction register (address 00C916) and the bit corresponding
to SIN pin of the port P1 direction register (address 00C316) 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
XIN
SIN
SOUT
SCLK
1/2
(Address 021416)
XCIN
1/2
CM7
1/2
Note : When the data is set in the serial I/O register (address 021416), 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 SOUT of rhe port P4 direction
register (address 00C916) to “1” And, to use SOUT pin for serial I/O,
set the corresponding bits of the port P4 direction register (address
00C916) 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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