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MSM6789A/6789L

PIN DESCRIPTIONS (for MSM6789L (3.3 V Version)) (Continued)

Symbol

Type

Description

Mode Selection.

Low level : Stand-alone mode

High level : Microcontroller interface mode

PDWN

Power Down. When a low level is input the MSM6789L goes to the power down

state. Unlike the RESET pin, this pin does not force the MSM6789L to be reset.

When an Low level is applied to this pin during recording operation, the MSM6789L

is halted, and will be maintained in the power down state while PDWN is low level.

After this pin is restored to a high level, postprocessing for recording will be

performed.

RSEL1

RSEL2

MSEL2

MSEL1

RSEL2

RSEL1

Memory capacity

¥ 1

¥ 2

¥ 3

¥ 4

These pins select the number of serial registers to be connected

externallly.

MCUM

A high input level causes the MSM6789L to be initialized and to go into the power

down state.

RESET

Bidirectional data bus to transfer commands and data to and from an external

microcontroller.

I/O

Write Pulse Input. Inputting a low pulse to WR pin causes a command or data

to be input via D0 to D3 pins.

Read Pulse Input. Inputting a low pulse to RD pin causes status bits or data to

be output via D0 to D3 pins.

Chip Enable Input. When the CE pin is set to low level and the CE pin is set to a

high level, the write pulse (WR) or read pulse (RD) can be accepted.

When the CE pin is set to a high level or CE pin is set to a low level, the write pulse

(WR) and read pulse (RD) cannot be accepted so that data cannot be communicated

via D0 to D3 pins.

RPM. This pin outputs a high level during recording or playback operation. The

state of this pin is the same as the contents of the RPM bit of the status register.

RPM

Busy. This pin outputs a high level while a command is being executed. When this

pin is held high, do not apply any data to D0 to D3 pins. The state of this pin is the

same as the contents of the BUSY bit of the status register.

BUSY

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