COP8AME9 datasheet(79/102 Pages) TI1

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COP8AME9, COP8ANE9

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SNOS930F – MARCH 2001 – REVISED MARCH 2013

Table 39. MICROWIRE/PLUS Master Mode Clock Select(1)

SL1

SL0

SK Period

2 × tC

4 × tC

8 × tC

(1)

Where tC is the instruction cycle clock

MICROWIRE/PLUS OPERATION

Setting the BUSY bit in the PSW register causes the MICROWIRE/PLUS to start shifting the data. It gets reset

when eight data bits have been shifted. The user may reset the BUSY bit by software to allow less than 8 bits to

shift. If enabled, an interrupt is generated when eight data bits have been shifted. The device may enter the

MICROWIRE/PLUS mode either as a Master or as a Slave. Figure 36 shows how two microcontroller devices

and several peripherals may be interconnected using the MICROWIRE/PLUS arrangements.

WARNING

The SIO register should only be loaded when the SK clock is in the idle phase.

Loading the SIO register while the SK clock is in the active phase, will result in

undefined data in the SIO register.

Setting the BUSY flag when the input SK clock is in the active phase while in

the MICROWIRE/PLUS is in the slave mode may cause the current SK clock for

the SIO shift register to be narrow. For safety, the BUSY flag should only be set

when the input SK clock is in the idle phase.

MICROWIRE/PLUS Master Mode Operation

In the MICROWIRE/PLUS Master mode of operation the shift clock (SK) is generated internally. The

MICROWIRE/PLUS Master always initiates all data exchanges. The MSEL bit in the CNTRL register must be set

to enable the SO and SK functions onto the G Port. The SO and SK pins must also be selected as outputs by

setting appropriate bits in the Port G configuration register. In the slave mode, the shift clock stops after 8 clock

pulses. Table 40 summarizes the bit settings required for Master mode of operation.

MICROWIRE/PLUS Slave Mode Operation

In the MICROWIRE/PLUS Slave mode of operation the SK clock is generated by an external source. Setting the

MSEL bit in the CNTRL register enables the SO and SK functions onto the G Port. The SK pin must be selected

as an input and the SO pin is selected as an output pin by setting and resetting the appropriate bits in the Port G

configuration register. Table 40 summarizes the settings required to enter the Slave mode of operation.

Table 40. MICROWIRE/PLUS Mode Settings(1)

G4 (SO)

G5 (SK)

Operation

Config. Bit

Fun.

Int.

MICROWIRE/PLUS

Master

TRI-

Int.

MICROWIRE/PLUS

STATE

Master

Ext.

MICROWIRE/PLUS

Slave

TRI-

Ext.

MICROWIRE/PLUS

STATE

Slave

(1)

This table assumes that the control flag MSEL is set.

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