HD404019R Datasheet, PDF (35/65 Pages) Renesas Technology Corp – CMOS 4-bit single-chip microcomputers

HD404019R Series
Item
Carry flag
(CA)
Accumulator
(A)
B register
(B)
W register
(W)
X/SPX register
(X/SPX)
Y/SPY register
(Y/SPY)
Serial data register (SR)
RAM
After MCU Reset to Recover from After MCU Reset to Recover from
Stop Mode
Other Modes
The contents of the items before
MCU reset are not retained. It is
necessary to initialize them by
software.
The contents of the items before
MCU reset are not retained. It is
necessary to initialize them by
software.
The contents of RAM before MCU Same as above for RAM
reset (just before STOP instruction)
are retained
Internal Oscillator Circuit
Figure 16 outlines the internal oscillator circuit. A crystal oscillator or ceramic oscillator can be selected as
the oscillator type. Refer to table 20 to select the oscillator type. In addition, see figure 17 for the layout of
the crystal or ceramic oscillator.
OSC₁
OSC₂
Oscillator
1/4
divider
circuit
Timing
generator
circuit
System
clock
Figure 16 Internal Oscillator Circuit
RGEOO^{TNSESSDESDCCTT}_{,,,,,,,,,,,,,,,,,,,,,,}⁰²¹ _{,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,}
Figure 17 Layout of Crystal or Ceramic Oscillator
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