M30218 Datasheet, PDF (102/179 Pages) Mitsubishi Electric Semiconductor – M30218 Group

Serial I/O2
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Serial I/O2
Serial I/O2 is used as the clock synchronous serial I/O and has an ordinary mode and an automatic transfer
mode. In the automatic transfer mode, serial transfer is performed through the serial I/O automatic transfer
RAM which has up to 256 bytes (addresses 0040016 to 004FF16).
The SRDY2, SBUSY2 and SSTB2 pins each have a handshake I/O signal function and can select either “H”
active or “L” active for active logic.
Table GA-1. Specifications of clock synchronous serial I/O2
Item
Serial mode
Specification
• 8-bit serial I/O mode (non-automatic transfer)
Transfer data format
• Automatic transfer serial I/O mode
• Transfer data length: 8 bits
Transfer clock
Transfer rate
• Full duplex mode / transmit-only mode selected by bit 5 at address 034216
• When internal clock is selected (bit 2 at address 034216 = “0”) : selected by bits 5 to 7 at address 034816
• When external clock is selected (bit 2 at address 034216 = “1”) : Input from SCLK21 pin, SCLK22 pin(Note 2)
• When internal clock is selected : f(XIN)/4, f(XIN)/8, f(XIN)/16, f(XIN)/32, f(XIN)/64, f(XIN)/128, f(XIN)/256
• When external clock is selected : input cycle 0.95 µs or less
Transmission/reception control
Transmission /
reception start condition
Transmission and
reception stop condition
Interrupt request
generation timing
• SSTB2 output / SBUSY2 input or output / SRDY2 input or output chosen
• To start transmission / reception, the following requirements must be met:
_ _{Serial I/O initialization bit (bit 4 at address 034216) = “1”}
_ _{When SBUSY2 input, or SRDY2 input is selected : selected input level = “H”}
____________
_________
_ _{When SBUSY2 input, or SRDY2 input is selected : selected input level = “L”}
• Furthermore, if external clock is selected, the following requirements must
also be met:
_ _{Input level of SCLK21 or SCLK22 = “H”}
• To stop transmission and reception, set serial I/O initialization bit (bit 4 at
address 034216) to “0” regardless internal clock and external clock.
• 8-bit serial I/O mode : Interrupts requested when 8-bit data transfer is com-
pleted
• Automatic transfer serial I/O mode :Interrupts requested when last receive
Select function
data transfer to Automatic transfer RAM
• SOUT2 P-channel output disable function
CMOS output or N-channel open-drain output can be selected
• LSB first/MSB first selection
Whether transmission/reception begins with bit 0 or bit 7 can be selected
• Serial I/O2 clock pin select bit
Serial clock input/output can be selected; SCLK21 or SCLK22
• SBUSY output, SSTB2 output select function (only automatic transfer serial
mode)
SBUSY output, SSTB2 output can be selected; 1-byte data transfer unit or all
data transfer unit
• SOUT2 pin control bit
Either output active or high-impedance can be selected as a SOUT2 pin state at
serial non-transfer .
Note 1: It is necessary to set the serial I/O clock pin select bit ( bit 7 at address 034216)
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