M32C83T datasheet(329/527 Pages) RENESAS

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Page 306

21. Intelligent I/O (Group 0, 1 Communication Function)

)

(

21.5 Group 2 Communication Function

The communication function is available when two 8-bit shift registers are used with the waveform genera-

tion function.

In the intelligent I/O group 2, the variable clock synchronous serial I/O or IEBus(1) communication function

is available. Figures 21.42 to 21.45 show registers associated with the communication function.

NOTES:

1. IEBus is a trademark of NEC Electronics Corporation.

Function

Group 2 SI/O Transmit Buffer Register

Bit Name

Bit

Symbol

Address

After Reset

G2TB

016D16-016C16

Indeterminate

SZ0

(b7 - b0)

(b12 - b11)

SZ2

SZ1

b15

Transfer Bit Length

Select Bit

Transmit Buffer

Data to be transmitted

: 8 bits long

: 1 bits long

: 2 bits long

: 3 bits long

: 4 bits long

: 5 bits long

: 6 bits long

: 7 bits long

b10

ACK Function

Select Bit

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

Parity Calculation

Continuing Bit(1)

Parity Function

Select Bit

0 : Adds no ACK bit

1 : Adds the ACK bit after last transmit bit

0 : Adds the parity bit after a data to be

transmitted

1 : Carries over a parity to a data to be

transmitted

0 : No parity

1 : Parity (even parity only)

NOTES:

1. Set the P bit to "0" before setting the PC bit to "1"

Function

Group 2 SI/O Receive Buffer Register

Bit Name

Bit

Symbol

Address

After Reset

G2RB

016F16 - 016E16

Indeterminate

Received data

OER

(b7 - b0)

(b11 - b8)

(b15 - b13)

0 : No overrun error

1 : Overrun error found

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

Receive Buffer

Overrun Error Flag(1)

NOTES:

1. The OER bit is set to "0" when the GMD1 to GMD0 bits in the G2MR register are set to "002"

(communication unit reset) or the RE bit in the G2CR register is set to "0" (receive disable).

b15

Figure 21.42 G2TB and G2RB Register

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