參數(shù)資料
型號: M37640E8
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述: 單芯片8位CMOS單片機(jī)
文件頁數(shù): 52/172頁
文件大?。?/td> 1193K
代理商: M37640E8
2-40
7/9/98
Input and Output Ports
7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
Port 8
7
This pin is multiplexed with the UART1 RTS signal. When bit 6 of the UART1 control register
(U1CON) is a “1”, the port acts as the RTS output signal.
Figure 2-49. Port P8
7
Block Diagram
2.7.1.2
Power and Ground Pins
There are two V
ss
and two V
dd
pins that supply power to the MCU. There is also one analog V
dd
(AV
dd
) and one analog V
ss
(AV
ss
) pin for the analog circuits.
2.7.1.3
CNV
ss
Pin
The level of the signal input to the CNV
ss
pin at reset determines whether the chip enters single chip
or microprocessor mode. With CNV
ss
connected to V
dd
, the MCU enters microprocessor mode after a
reset. After the reset sequence has been completed, the mode can be changed by modifying the value
of bits 0 and 1 of CPMA. However, while CNV
ss
is connected V
dd
, bit 1 of CPMA can not be
overwritten. With CNV
ss
connected to V
ss
, the MCU enters single chip mode after a reset.
2.7.1.4
X
in
and X
out
Pins
The X
in
and X
out
pins are clock input and output pins. This device has a built-in clock generation
circuit whose oscillation frequency is set by a quartz oscillator. Also, an external clock source can be
used by connecting the X
in
pin to a clock generator and leaving the X
out
pin floating. The frequency
of X
in
can be
48MHz with an external clock source and
24MHz with a crystal.
2.7.1.5
XC
in
and XC
out
Pins
The P5
0
/XC
in
and P5
1
/T
out
/XC
out
pins are clock input and output pins. This device has a built-in clock
generation circuit whose oscillation frequency is set by a ceramic or quartz oscillator. An external
clock may also be used by connecting the XC
in
pin to a clock generator and leaving the XC
out
pin
floating. The frequency of XC
in
can be
5MHz with an external clock source or 32KHz with a
crystal.
2.7.1.6
RESET Pin
The MCU is reset by holding RESET low for at least 2
μ
s before returning to high.
Direction Register
Data Bus
Port Latch
UART1 RTS Enable Bit
UART1 RTS Output
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