4513 datasheet(49/210 Pages) RENESAS

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HARDWARE

4513/4514 Group User’s Manual

FUNCTION BLOCK OPERATIONS

SERIAL I/O

The 4513/4514 Group has a built-in clock synchronous serial I/O

which can serially transmit or receive 8-bit data.

Serial I/O consists of;

• serial I/O register SI

• serial I/O mode register J1

• serial I/O transmission/reception completion flag (SIOF)

• serial I/O counter

Registers A and B are used to perform data transfer with internal

CPU, and the serial I/O pins are used for external data transfer.

The pin functions of the serial I/O pins can be set with the register

J1.

Table 11 Serial I/O pins

P20/SCK

P21/SOUT

P22/SIN

Pin function when selecting serial I/O

Clock I/O (SCK)

Serial data output (SOUT)

Serial data input (SIN)

Note: Input ports P20–P22 can be used regardless of register J1.

Fig. 22 Serial I/O structure

Table 12 Serial I/O mode register

J13

J12

J11

J10

Serial I/O mode register J1

This bit has no function, but read/write is enabled.

Instruction clock signal divided by 8

Instruction clock signal divided by 4

Input ports P20, P21, P22 selected

Serial I/O ports SCK, SOUT, SIN/input ports P20, P21, P22 selected

External clock

Internal clock (instruction clock divided by 4 or 8)

Not used

Serial I/O internal clock dividing ratio

selection bit

Serial I/O port selection bit

Serial I/O synchronous clock selection bit

at reset : 00002

at RAM back-up : state retained

Note: “R” represents read enabled, and “W” represents write enabled.

R/W

J12

SIOF

J12

J11

J10

J11

J10

MSB

1/4

1/8

P21/SOUT

P22/SIN

P20/SCK

TSIAB

TABSI

SOUT

SIN

SCK

J13

MR3

XIN

Division circuit

(divided by 2)

Internal clock

generation circuit

(divided by 3)

Instruction clock

Serial I/O mode register J1

Serial I/O interrupt

Serial I/O counter (3)

Synchronous

circuit

Serial I/O register SI (8)

LSB

Note: The output structure of SCK and SOUT pins is N-channel open-drain.

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