MN63Y1208 Datasheet, PDF (25/120 Pages) Panasonic Semiconductor – Built-in 4-Kbit FeRAM non-volatile memory with fast write and low power consumption

Chapter 3 Memory Map
„ INTWT
INTWT specifies the maximum wait time between characters in I2C communication.
INTWT is determined using the following formula.
Maximum wait time between characters = T × 2^INTWT
T: Typ. 942 µs (±25%)
INTWT: 0 to 3 (default: 3; typ. approximately 7.5ms )
When this field is set to a value other than 0 to 8, a default value will be applied.
„ RESWT
RESWT specifies the maximum wait time from the start of response to the command (NIRQ = L) until slave
transmission request input in I2C communication.
RESWT is determined using the following formula.
Maximum wait time for starting response = T × 2^RESWT
T:
Typ. 1.88ms(±25%)
RESWT:
0 to 3: (default: 3, typ. approximately 15 ms)
When this field is set to a value other than 0 to 12, a default value will be applied.
Note: T includes an error of ±25%. Set the INTWT and RESWT values in consideration of the error.
„ IRQSEL
IRQSEL is used for IRQ notification to add the condition of generating an interrupt to the NIRQ pin.
Setting IRQSEL allows an additional interrupt to be generated in addition to a normal host command
processing complete interrupt.
There are two user-selectable additional interrupt sources, RF communication detection or reader/writer
magnetic-field detection. In addition, RF communication can be detected when RF response transmission is
completed or when a write to FeRAM with the RF command is completed (selectable).
For more information about interrupt source, see Chapter 6 Interrupt Generation Function.
The IRQSEL settings are as follows.
Table 3-13 IRQSEL Setting for IRQ Notification
Bit 2
0
0
1
1
X
X
Bit 1
0
1
0
1
X
X
Bit 0
X
X
X
X
0
1
Meaning
Do not generate an interrupt when RF response transmission is completed or when a
write to FeRAM with the RF command is completed.
Reserved
Generate an interrupt when RF response transmission is completed.
Generate an interrupt when a write to FeRAM with the RF command is completed.
Do not generate an interrupt when a magnetic field is detected.
Generate an interrupt when a magnetic field is detected.
By default, value of each bit of IRQSEL is 0.
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