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User’s Manual U16896EJ2V0UD
624
CHAPTER 25 MASK OPTION/OPTION BYTE
25.1 Mask Option (Mask ROM Versions)
The mask ROM versions (
μ
PD703302 and 703302Y) have the following mask options.
•
Connection of pull-up resistor to P38 and P39 pins
•
Enabling/disabling stopping internal oscillator by software
•
Shortening oscillation stabilization time of main clock oscillation after release of reset
(1) Connection of pull-up resistor to P38 and P39 pins
PUmn
Connection of Pull-up Resistor to Port mn
0 Not
connected
1 Connected
Remark
mn = 38, 39
(2) Enabling/disabling stopping internal oscillator by software
RSTP
Control of Stopping Internal Oscillator by Software
0
Can be stopped by software
1
Setting invalid by software
Depending on whether the option to enable/disable stopping of internal oscillator by software is set or not, the
operation differs as follows.
Table 25-1. Option to Enable/Disable Stopping of Internal Oscillator by Software
RSTP = 0 (Can Be Stopped)
RSTP = 1 (Setting Invalid)
Internal oscillator
Internal oscillation clock: Can be stopped.
RCM.RSTOP bit can be set.
Internal oscillation clock: Cannot be stopped.
Setting of RSTOP bit is invalid.
Count operation
Operation can be stopped by
WDTM2.WDCS24 bit.
Operation cannot be stopped.
Input clock
The following clock can be selected by the
WDTM2 register.
•
Internal oscillation clock: f
R
/8
•
Subclock: f
XT
Fixed to Internal oscillation clock (f
R
/8)
(overflow time can be set)
WDT2
Operation mode
The following mode can be selected by the
WDTM2 register.
•
NMI interrupt mode (INTWDT2)
•
Reset mode (WDTRES2)
Fixed to reset mode (WDTRES2)
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