参数资料
型号: M37225M6-XXXSP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42
封装: 0.600 INCH, PLASTIC, SDIP-42
文件页数: 47/126页
文件大小: 1486K
代理商: M37225M6-XXXSP
27
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
M37225M6/M8/MA/MC–XXXSP
M37225ECSP
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 port P2.
Bit 3 of the serial I/O mode register (address 00DC16) 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 4, 16, 32, or 64. To use SIN pin
for serial I/O, set the corresponding bit of the port P2 direction regis-
ter (address 00C516) 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
Synchronous
circuit
Frequency divider
1/32
1/4
1/64
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)
(See note)
SM : Serial I/O mode register
Note : When the data is set in the serial I/O register (address 00DD16), the register functions as the serial I/O shift register.
Selection gate : Connected to
black side at
reset
1/16
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M37225MA-XXXSP 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42
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