M32C83T datasheet(224/527 Pages) RENESAS

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Page 201

16. Serial I/O (Special Function)

)

(

Function

Start condition and stop condition

output

Timing to generate a start condition

and stop condition interrupt request

STSPSEL = 1

The STAREQ bit, RSTAREQ bit and

STPREQ bit determine how the start

condition or stop condition is output

Start condition and stop condition

generation are completed

STSPSEL = 0

Program with a port determines

how the start condition or stop

condition is output

The start condition and stop

condition are detected

SDAi

Start condition detect

interrupt

Stop condition detect

interrupt

(1) In slave mode,

CKDIR is set to "1" (external clock)

STSPSEL is set to "0" (no start condition and stop condition output)

SCLi

SDAi

Start condition detect

interrupt

Stop condition detect

interrupt

SCLi

STAREQ=1

(start)

STPREQ=1

(start)

(1) In master mode,

CKDIR is set to "0" (internal clock)

STSPSEL is set to "1" (start condition and stop condition output)

Setting value of

the STSPEL bit

i=0 to 4

16.3.2 Start Condition or Stop Condition Output

The start condition is generated when the STAREQ bit in the UiSMR4 register (i=0 to 4) is set to "1"

(start). The restart condition is generated when the RSTAREQ bit in the UiSMR4 register is set to "1"

(start). The stop condition is generated when the STPREQ bit in the UiSMR4 is set to "1" (start).

The start condition is output when the STAREQ bit is set to "1" and the STSPSEL bit in the UiSMR4

when the RSTAREQ bit and STSPSEL bit are set to "1". The stop condition is output when the STPREQ

bit and the STSPSEL bit are set to "1".

When the start condition, stop condition or restart condition is output, do not generate an interrupt be-

tween the instruction to set the STAREQ bit, STPREQ bit or RSTAREQ bit to "1" and the instruction to set

the STSPSEL bit to "1". When the start condition is output, set the STAREQ bit to "1" before the

STSPSEL bit is set to "1".

Table 16.18 lists function of the STSPSEL bit. Figure 16.22 shows functions of the STSPSEL bit.

Table 16.18 STSPSEL Bit Function

Figure 16.22 STSPSEL Bit Function

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