SM5L1 データシートの表示（PDF） - Sharp Electronics

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SM5L1

4-Bit Single Chip Microcomputers

Sharp Electronics 

4-Bit Single Chip Microcomputers

SM5L1/SM5L2/SM5L3

Flags

The SM5Lx provides three flag (C flag and interrupt

request flags IFA and IFD) which can be used to set or

determine conditions.

Output Latch Registers and Mode Registers

The output latch registers are connected to the P0,

P1 and P2 pins. By instruction, the contents of the ACC

can be transferred to the output latch registers. The

SM5Lx also contains mode registers RD, RE and RF.

Setting the value of each register enables the LCD or

interrupt to be controlled. Setting a register is performed

in the same way as for the other output pins. The func-

tion of the mode registers are shown in Table 1.

INTA PIN

• INTA level can be loaded to ACC (bit 0), as follows:

LBLX 4

IN

• INTA level does not load directly through the noise

debounce circuit (see Figure 17).

INTA PIN

LEVEL

SM5L1/L2/L3

TO ACC

TO INTERRUPT

CONTROLLER

NOICE DEBOUNCE CIRCUIT

Figure 17. INTA Pin

5L1-17

CAUTION

Connecting Consideration of I/O Port

When using an I/O port as bidirectional bus such as data bus,

avoid setting the I/O port to output when the target pin is also

set output.

Whenever the output data conflict with each other, system

failure will happen, due to damaged circuits or instantaneous

supply voltage drop.

SM5Lx

OUTPUT PIN or

I/O PIN SET OUTPUT

DON'T

DATA BUS OF THE

CONNECTED DEVICE

OUTPUT PIN

REGISTER

TYPE

BIT

RD0

RD

RD1

RD2, RD3

RE0

RE1

RE

RE2

RE3

RF0

RF1

RF

RF2

RF3

5L1-18

Figure 18. I/O Port Connection Precaution

Table 1. Mode Register Setting

SET

VALUE

0

1

—

—

0

1

—

0

1

—

0

1

0

1

0

1

—

MODE DESCRIPTION

Clears the ME F/F to stop a melody.

Sets the ME F/F to start a melody from a ROM pointer address.

Sets by stop instruction (of melody code) and reset by TPB instruction.

Sets ‘0’ only.

Masks the interrupt based on the IFA flag.

Accepts the interrupt based on the IFA flag.

Sets ‘0’ only.

Masks the interrupt based on the IFD flag.

Accepts the interrupt based on the IFD flag.

No setting.

Turns off the LCD.

Turns on the LCD.

Stops the function of a booster circuit.

Operates the function of a booster circuit.

Creates the system clock frequency by dividing the main oscillation frequency by 2.

Creates the system clock frequency by dividing the main oscillation frequency by 4.

Sets ‘0’ only.

Microcomputer Data Sheet

13

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