參數(shù)資料
型號: M30624FGNGP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100
文件頁數(shù): 49/213頁
文件大?。?/td> 3351K
代理商: M30624FGNGP
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UART2 Special Mode Register
142
Mitsubishi microcomputers
M16C / 62N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
An attempt to read Port P71 (SCL) results in getting the terminal’s level regardless of the content of the
port direction register. The initial value of SDA transmission output in this mode goes to the value set in
port P70. The interrupt factors of the bus collision detection interrupt, UART2 transmission interrupt, and
of UART2 reception interrupt turn to the start/stop condition detection interrupt, acknowledgment non-
detection interrupt, and acknowledgment detection interrupt respectively.
The start condition detection interrupt refers to the interrupt that occurs when the falling edge of the SDA
terminal (P70) is detected with the SCL terminal (P71) staying “H”. The stop condition detection interrupt
refers to the interrupt that occurs when the rising edge of the SDA terminal (P70) is detected with the SCL
terminal (P71) staying “H”. The bus busy flag (bit 2 of the UART2 special mode register) is set to “1” by the
start condition detection, and set to “0” by the stop condition detection.
The acknowledgment non-detection interrupt refers to the interrupt that occurs when the SDA terminal
level is detected still staying “H” at the rising edge of the 9th transmission clock. The acknowledgment
detection interrupt refers to the interrupt that occurs when SDA terminal’s level is detected already went
to “L” at the 9th transmission clock. Also, assigning 1 1 0 1 (UART2 reception) to the DMA1 request factor
select bits provides the means to start up the DMA transfer by the effect of acknowledgment detection.
Bit 1 of the UART2 special mode register (037716) is used as the arbitration lost detecting flag control bit.
Arbitration means the act of detecting the nonconformity between transmission data and SDA terminal
data at the timing of the SCL rising edge. This detecting flag is located at bit 11 of the UART2 reception
buffer register (037F16, 037E16), and “1” is set in this flag when nonconformity is detected. Use the
arbitration lost detecting flag control bit to choose which way to use to update the flag, bit by bit or byte by
byte. When setting this bit to “1” and updated the flag byte by byte if nonconformity is detected, the
arbitration lost detecting flag is set to “1” at the falling edge of the 9th transmission clock.
If update the flag byte by byte, must judge and clear (“0”) the arbitration lost detecting flag after complet-
ing the first byte acknowledge detect and before starting the next one byte transmission.
Bit 3 of the UART2 special mode register is used as SCL- and L-synchronous output enable bit. Setting
this bit to “1” goes the P71 data register to “0” in synchronization with the SCL terminal level going to “L”.
Figure 1.17.27 shows the functional block diagram for I2C mode. Setting “1” in the I2C mode select bit
(IICM) causes ports P70, P71, and P72 to work as data transmission-reception terminal SDA, clock input-
output terminal SCL, and port P72 respectively. A delay circuit is added to the SDA transmission output,
so the SDA output changes after SCL fully goes to “L”. When digital delay is selected, the amount of delay
can be selected in the range of 2 cycles to 8 cycles of f1 using UART2 special mode register 3 (at address
037516). Delay circuit select conditions are shown in Table 1.17.10.
Table 1.17.10. Delay circuit select conditions
Digital delay is
selected
001
111
1
No delay
0
(000)
IICM
SDDS
DL
Register value
Contents
Digital delay is added
When IICM = “0”, no delay circuit is selected. When IICM = “0”,
however, always make sure SDDS = “0”.
to
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