Renesas Asynchronous SH7145F Uživatelský manuál stáhnout pdf (Strana 6)

SH7145F

Multiprocessor Communications

REJ06B0358-0100O/Rev.1.00 March 2004 Page 6 of 17

3. Operation

Figure 3 shows reception operation when the do not IDs match, and figure 4 shows reception

operation when they do match. To help explain figures 3 and 4, tables 3 and 4 list the software and

hardware processing that is performed.

Transmission operation is identical to asynchronous serial data transmission, except that the

MPBT bit in SSR_0 is set to 1 when transmitting the ID.

RXD0

(pin)

RDRF

(SSR_0 bit)

MPB

(1)

(2)

(3)

(4)

(5)

(6)

MPIE

(SCR_0 bit)

(7)

MPB

Stop

bit

Start

bit

Start

bit

Start

bit

Stop

bit

Data bits D0 to D7

Figure 3 Reception Operation when IDs Do Not Match

Table 3 Processing

Software Processing Hardware Processing

(1) — ClearMPIEflaginSCR_0to0(receiveID

data)

(2) — RSR_0 receives serial data and transfers it to

RDR_0

(3) — Set RDRF flag in SSR_1 to 1

(4) Read data from RDR_1 —

(5) Compare with own ID —

(6) Clear RDRF flag in SSR_1 and MPIE

flaginSCR_0to0

—

(7) — Do not receive data transmitted when MPIE

flag value was 1 because MPB bit is 0

1 2 3 4 5 6 7 8 9 10 11 ... 16 17

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