UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 257

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

(2) When used as interrupt
• When starting operation
<1> Mask the LVI interrupt (LVIMK = 1).
<2> Set the detection voltage using bits 3 to 0 (LVIS3 to LVIS0) of the low-voltage detection level select
<3> Set bit 7 (LVION) of LVIM to 1 (enables LVI operation).
<4> Use software to instigate a wait of at least 0.2 ms.
<5> Wait until “supply voltage (V
<6> Clear the interrupt request flag of LVI (LVIIF) to 0.
<7> Release the interrupt mask flag of LVI (LVIMK).
<8> Execute the EI instruction (when vector interrupts are used).
Figure 16-5 shows the timing of generating the interrupt signal of the low-voltage detector. Numbers <1> to
<7> in this figure correspond to <1> to <7> above.
• When stopping operation
Either of the following procedures must be executed.
•
•
When using 8-bit memory manipulation instruction: Write 00H to LVIM.
When using 1-bit memory manipulation instruction: Clear LVION to 0.
register (LVIS).
CHAPTER 16 LOW-VOLTAGE DETECTOR
DD
) ≥ detection voltage (V
User’s Manual U16898EJ5V0UD
LVI
)” at bit 0 (LVIF) of LVIM is confirmed.
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