參數(shù)資料
型號: 32170
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER
中文描述: 單芯片32位CMOS微機
文件頁數(shù): 39/49頁
文件大小: 561K
代理商: 32170
Mitsubishi Microcomputers
39
SINGLE-CHIP 32-BIT CMOS MICROCOMPUTER
2001-5-14 Rev.1.0
32170 Group, 32174 Group
6-channel High-speed Serial I/Os
The microcomputer contains six channels of serial I/Os con-
sisting of four channels that can be set for CSIO mode
(clock-synchronized serial I/O) or UART mode (asynchro-
nous serial I/O) and two other channels that can only be set
for UART mode.
The SIO has the function to generate a DMA transfer re-
quest when data reception is completed or the transmit reg-
ister becomes empty, and is capable of high-speed serial
communication without causing any additional CPU load.
Table 20 Outline of Serial I/O
Item
Content
Number of channels
CSIO/UART: 4 channels (SIO0,SIO1,SIO4,SIO5)
UART only : 2 channels (SIO2,SIO3)
Clock
During CSIO mode : Internal clock / external clock, selectable (Note1)
During UART mode : Internal clock only
Transfer mode
Transmit half-duplex, receive half-duplex, transmit/receive full-duplex
BRG count sourcef
(BCLK), f(BCLK)/8, f(BCLK)/32, f(BCLK)/256 (When internal clock is selected) (Note2)
Data format
CSIO mode :
Data length = Fixed to 8 bits
Order of transfer = Fixed to LSB first
UARTmode :
Start bit = 1 bit
Character length = 7, 8, or 9 bits
Parity bit = Added or not added (When added, selectable between
odd and even parity)
Stop bit = 1 or 2 bits
Order of transfer = Fixed to LSB first
Baud rate
CSIO mode :
152 bits per second to 2 Mbits per second (when operating with f(BCLK) = 20 MHz)
UARTmode :
19 bits per second to 156 Kbits per second (when operating with f(BCLK) = 20 MHz)
Error detection
CSIO mode :
Overrun error only
UARTmode :
Overrun, parity, and framing errors
(The error-sum bit indicates which error has occurred)
Fixed cycle clock
output function
When SIO0, SIO1, SIO4, or SIO5 is in UART mode, this function outputs a 1/2 BRG clock from the SCLK pin.
Note 1: During CSIO mode, the maximum input frequency of an external clock is f(BCLK) divided by 16.
Note 2: When f(BCLK) is selected for the BRG count source, the BRG set value is subject to limitations.
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