參數(shù)資料
型號(hào)： M30100
廠商： Renesas Technology Corp.
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機(jī)
文件頁數(shù)： 98/164頁
文件大小： 3302K
代理商： M30100
deveopment
Tentative Specifications REV.E1
Serial I/O
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30100/M30102 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
97
Figure 1.15.1. Block diagram of UARTi (i = 0, 1)
Serial I/O
Serial I/O is configured as two channels: UART0 and UART1. UART0 and UART1 each have an exclusive
timer to generate a transfer clock, so they operate independently of each other.
Figure 1.15.1 shows the block diagram of UARTi (i=0,1). Figure 1.15.2 shows the block diagram of the
transmit/receive unit.
UART0 has two operation modes: a clock synchronous serial I/O mode and a clock asynchronous serial I/
O mode (UART mode). The contents of the serial I/O mode select bits (bits 0 to 2 at addresses 00A0
16
and
00A8
16
) determine whether UART0 is used as a clock synchronous serial I/O or as a UART. Although a few
functions are different, UART0 and UART1 have almost the same functions.
Figures 1.15.3 through 1.15.5 show the registers related to UARTi.
Bit rate generator
(Address 00A1
16
)
Clock synchronous type
(when internal clock is selected)
UART reception
Clock synchronous type
UART transmission
Clock synchronous type
Clock synchronous type
(when internal clock is selected)
Clock synchronous type
(when external clock is selected)
Receive
clock
Transmit
clock
Clock source selection
f
1
f
8
Internal
External
Bit rate generator
(Address 00A9
16
)
Receive
clock
Transmit
clock
Clock source selection
f
1
f
8
n0 : Values set to UART0 bit rate generator (BRG0)
n1 : Values set to UART1 bit rate generator (BRG1)
Clock output pin
select switch
RxD
0
1 / (n
0
+1)
1/16
1/16
1/2
CLK
0
TxD
0
RxD
1
1 / (n
1
+1)
1/16
1/16
1/2
CLK
1
TxD
1
(UART1)
(UART0)
CLKS
1
Reception
control circuit
Transmission
control circuit
Transmit/
receive
unit
CLK
polarity
reversing
circuit
Transmit/
receive
unit
Reception
control circuit
Transmission
control circuit
Clock synchronous type
(when internal clock is selected)
Clock synchronous type
(when external clock is selected)
UART reception
Clock synchronous type
UART transmission
Clock synchronous type
Clock synchronous type
(when internal clock is selected)
Internal
External
CLK
polarity
reversing
circuit
f
32
f
c
f
32
f
c
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