4513 datasheet(36/97 Pages) RENESAS

36 / 97 page

4513/4514 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

Fig. 23 Serial I/O register state when transferring

(1) Serial I/O register SI

Serial I/O register SI is the 8-bit data transfer serial/parallel conver-

sion register. Data can be set to register SI through registers A and

B with the TSIAB instruction. The contents of register A is transmit-

ted to the low-order 4 bits of register SI, and the contents of

During transmission, each bit data is transmitted LSB first from the

lowermost bit (bit 0) of register SI, and during reception, each bit

data is received LSB first to register SI starting from the topmost bit

(bit 7).

When register SI is used as a work register without using serial I/O,

pull up the SCK pin or set the pin function to an input port P20.

(2) Serial I/O transmission/reception

completion flag (SIOF)

Serial I/O transmission/reception completion flag (SIOF) is set to

“1” when serial data transmission or reception completes. The

state of SIOF flag can be examined with the skip instruction

(SNZSI). Use the interrupt control register V2 to select the inter-

rupt or the skip instruction.

The SIOF flag is cleared to “0” when the interrupt occurs or when

the next instruction is skipped with the skip instruction.

When transmitting (D7–D0 : transfer data)

When receiving

D7 D6 D5 D4 D3 D2 D1 D0

SIN pin

SOUT pin

∗

SOUT pin

SIN pin

Serial I/O register (SI)

D7 D6 D5 D4 D3 D2 D1 D0

D1 D0

Transfer data to be set

Transfer started

Transfer completed

∗ ∗∗∗∗∗ ∗

∗∗ ∗∗∗∗∗ ∗

∗ ∗∗∗∗∗ ∗

∗∗∗∗∗ ∗

∗∗∗∗ ∗∗∗∗

D7 D6 D5 D4 D3 D2

∗∗

D7 D6 D5 D4 D3 D2 D1

∗

D7 D6 D5 D4 D3 D2 D1 D0

(3) Serial I/O start instruction (SST)

When the SST instruction is executed, the SIOF flag is cleared to

“0” and then serial I/O transmission/reception is started.

(4) Serial I/O mode register J1

and P22/SIN pin function. Set the contents of this register through

used to transfer the contents of register J1 to register A.

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