参数资料
型号: M37902FCCHP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 26 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件页数: 113/143页
文件大小: 1148K
代理商: M37902FCCHP
71
M37902FCCHP, M37902FGCHP, M37902FJCHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Selection of transfer format
In clock synchronous serial communication, transfer format can be
selected by bit 7 of the transmit/receive control register 0. When bit 7
is “0”, transfer format is LSB first. When bit 7 is “1”, transfer format is
MSB first.
This function is realized by changing connection relation between
the transmit buffer register and the receive buffer register when writ-
ing transmit data to the transmit buffer register or reading receive
data from the receive buffer register. Accordingly, the transmitter’s
operation is the same in both transfer formats.
Figure 72 shows the connection relation.
Fig. 72 Connection relation between transmit buffer register, receive buffer register, and data bus
Bit 7 in transmit/receive
control register 0
Write to transmit
buffer register
Read from receive
buffer register
0
(LSB first)
1
(MSB first)
Transmit buffer
register
DB7
Data bus
D7
D6
D5
D4
D3
D2
D1
D0
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Transmit buffer
register
DB7
Data bus
D7
D6
D5
D4
D3
D2
D1
D0
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Receive buffer
register
DB7
Data bus
D7
D6
D5
D4
D3
D2
D1
D0
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Receive buffer
register
DB7
Data bus
D7
D6
D5
D4
D3
D2
D1
D0
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Precautions for clock synchronous serial
communication
________ ________
When using pin CTS0/RTS0, be sure to clear the D-A2 output enable
bit (bit 2 at address 9616) to “0” (output disabled). Also, in the clock
_______
synchronous serial communication, the separate function for CTSi/
_______
RTSi cannot be selected. Furthermore, when an internal clock is se-
_______
lected, RTS output is undefined. Therefore, do not use the RTS func-
tion.
Before transmit operation is performed, be sure to clear bits 2 and 3
of the serial I/O pin control register (address AC16) to “00”.
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