7477 datasheet(149/354 Pages) RENESAS

149 / 354 page

7470/7471/7477/7478 GROUP USER’S MANUAL

1-132

HARDWARE

1.13 Serial I/O

Fig. 1.13B.14 Structure of Serial I/O status register

(2) Serial I/O status register (SIOSTS: Address 00E116)

The Serial I/O status register consists of flags for representing the buffer/register state to be used

for data transfer, and error flags.

q This register is a read-only type.

q Bit 7 is unused and “1” at a read operation.

Figure 1.13B.14 shows a structure of the Serial I/O status register.

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O status register (SIOSTS) [Address

At reset

R W

Serial I/O status register (7477/7478 group)

Name

Function

Transmit buffer

empty flag (TBE)

0 : Buffer full

1 : Buffer empty

Receive buffer full

flag (RBF)

0 : Buffer empty

1 : Buffer full

Transmit shift

completion flag (TSC)

0 : Transmit shift in progress

1 : Transmit shift completed

Overrun error flag

(OE)

0 : No error

1 : Overrun error

Parity error flag

(PE)

0 : No error

1 : Parity error

Framing error flag

(FE)

0 : No error

1 : Framing error

Nothing is allocated for this bit. This is a write

disabled bit. When this bit is read out, the value

is “1.”

Summing error

flag (SE)

0 : (OE) U (PE) U (FE) = 0

1 : (OE) U (PE) U (FE) = 1

00E116]

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