M306V0ME Mitsubishi, M306V0ME Datasheet - Page 99

• Manufacturer Part Number: M306V0ME
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

Rev. 1.0
2.11 Serial I/O
2.11.1 UART0 and UART2
Table 2.11.1 Comparison of functions of UART0 and UART2
Notes 1: Only when clock synchronous serial I/O mode.
Serial I/O is configured as two units: UART0 and UART2.
UART0 and UART2 each have an exclusive timer to generate a transfer clock, so they operate indepen-
dently of each other.
Figure 2.11.1 shows the block diagram of UART0 and UART2. Figures 2.11.2 and 2.11.3 show the block
diagram of the transmit/receive unit.
UARTi (i = 0 and 2) 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 03A0
and 0378
few functions are different, UART0 and UART2 have almost the same functions.
UART0 and UART2 are almost equal in their functions with minor exceptions. UART2, in particular, is
compliant with the SIM interface and I
nous serial I/O mode (Note). It also has the bus collision detection function that generates an interrupt
request if the TxD pin and the RxD pin are different in level.
Table 2.11.1 shows the comparison of functions of UART0 and UART2, and Figures 2.11.4 to 2.11.14
show the registers related to UARTi.
CLK polarity selection
LSB first / MSB first selection
Continuous receive mode selection
Transfer clock output from multiple
pins selection
Serial data logic switch
Sleep mode selection
TxD, RxD I/O polarity switch
TxD, RxD port output format
Parity error signal output
Bus collision detection
4: Using for SIM interface.
2: Only when clock synchronous serial I/O mode and 8-bit UART mode.
3: Only when UART mode.
16
) determine whether UARTi is used as a clock synchronous serial I/O or as a UART. Although a
Function
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
2
Possible
Possible
Possible
Impossible
Impossible
Possible
Impossible
CMOS output
Impossible
Impossible
C-BUS interface with some extra settings added in clock-synchro-
UART0
(Note 1)
(Note 1)
(Note 1)
(Note 3)
Possible
Possible
Possible
Impossible
Possible
Impossible
Possible
N-channel open-drain
output
Possible
Possible
UART2
and ON-SCREEN DISPLAY CONTROLLER
(Note 1)
(Note 2)
(Note 1)
(Note 4)
(Note 4)
MITSUBISHI MICROCOMPUTERS
M306V0ME-XXXFP
M306V0EEFP
16
99