SH7018 datasheet(219/431 Pages) RENESAS

219 / 431 page

203

12.1.4

Table 12.2 summarizes the SCI1 internal registers. These registers specify the data format and bit

rate, and control the transmitter and receiver sections.

Table 12.2

Registers

Name

Abbreviation

R/W

Initial Value

Address*

Access Size

Serial mode register

SMR1

R/W

H'00

H'FFFF81B0

8, 16

Bit rate register

BRR1

R/W

H'FF

H'FFFF81B1

8, 16

Serial control register

SCR1

R/W

H'00

H'FFFF81B2

8, 16

Transmit data register

TDR1

R/W

H'FF

H'FFFF81B3

8, 16

Serial status register

SSR1

R/(W)*

H'84

H'FFFF81B4

8, 16

Receive data register

RDR1

H'00

H'FFFF81B5

8, 16

Notes: 1. Do not attempt to access empty addresses.

2. The only value that can be written is a 0 to clear the flags.

12.2

12.2.1

Receive Shift Register (RSR1)

The receive shift register (RSR1) receives serial data. Data input at the RxD pin is loaded into the

RSR1 in the order received, LSB (bit 0) first, converting the data to parallel form. When one byte

has been received, it is automatically transferred to the RDR1.

The CPU cannot read or write the RSR1 directly.

Bit:

R/W:

—

12.2.2

Receive Data Register (RDR1)

The receive data register (RDR1) stores serial receive data. The SCI1 completes the reception of

one byte of serial data by moving the received data from the receive shift register (RSR1) into the

RDR1 for storage. The RSR1 is then ready to receive the next data. This double buffering allows

the SCI1 to receive data continuously.

The CPU can read but not write the RDR1. The RDR is initialized to H'00 by a power-on reset or

in standby mode.

SH7018 Datasheet(PDF) 219 Page - Renesas Technology Corp

SH7018 Datasheet(HTML) 219 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL