Texas Instruments TCM4300 Mitsubishi Microcontroller Mode of Operation, Mcrw Mcds, IRQ NMI Dint

4.24.2Mitsubishi Microcontroller Mode of Operation

When the microcontroller type select MTS1 and MTS0 inputs are held high and low, respectively, the TCM4300 microcontroller interface is configured in Mitsubishi mode. In this mode, the interface has a single read/write control (R/W) signal, an active-low data strobe (MCDS) signal, and active-low interrupt request signals. The processor E and R/(W) signals should be connected to the TCM4300 MCDS signal and the MCRW signal, respectively. Table 4±26 lists the microcontroller interface connections for Mitsubishi mode.

	Table 4±26. Microcontroller Interface Connections for Mitsubishi Mode
TCM4300				MICROCONTROLLER TERMINAL
TERMINAL
MTS1, MTS0		Tie to logic levels: high and low, respectively
MCCSH		Not on microcontroller; can be used for address decoding
MCCSL		Not on microcontroller; can be used for address decoding
MCD7±MCD0		D[7:0] data bus on microcontroller
MCA4±MCA0		A[4:0]
MCRW
		R/W
MCDS			(Active-low read data strobe) MCDS configured to active-low operation by MTS1 and MTS0.
		E
MWBDFINT		Either one of INT3 through INT0 as appropriate
DINT		Either one of INT3 through INT0 as appropriate

4.24.3Motorola Microcontroller Mode of Operation

When the microcontroller selects MTS0 = high and MTS1 = low, the TCM4300 microcontroller interface is configured for 8-bit family (6800 family derivatives, e.g., 68HC11D3 and 68HC11G5) bus characteristics, and when the microcontroller selects MTS0 = low and MTS1 = high, the microcontroller interface is configured for 16-bit family (680 ⋅0 family derivatives, e.g., 68008 and 68302) characteristics. The Motorola mode makes use of a single read/write control (R/W) signal and active-low interrupt request signals. The processor E (8-bit) or DS (16-bit) and (R/W) control signals should be connected to the TCM4300 MCDS signal and the MCRW signal, respectively. Table 4±27 illustrates the connections between the TCM4300 and an 8-bit Motorola processor. Table 4±28 illustrates the connections between the TCM4300 and a 16-bit Motorola processor.

Table 4±27. Microcontroller Interface Connections for Motorola Mode (8 bits)

TCM4300				MICROCONTROLLER TERMINAL
TERMINAL
MTS1, MTS0	Tie to logic levels: low and high, respectively
MCCSH	Not on microcontroller; can be used for address decoding
MCCSL	Not on microcontroller; can be used for address decoding
MCD7±MCD0	PC[7:0] data bus on microcontroller
MCA4±MCA0	Demultiplexed address output. PF[4:0] on microcontroller for nonmultiplexed machines (e.g.,
	68CH11G5) and not on micro for multiplexed bus machines (e.g., 68HC11D3).
MCRW
	R/W
MCDS	E (Active-high data strobe) MCDS configured to active-high operation by MTS1 and MTS0.
MWBDFINT		and/or		as appropriate
	IRQ		NMI
DINT		and/or		as appropriate
	IRQ		NMI

4±30