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1.8 Mask Option List
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1.8 Mask Option List
Various options are available with the MB90660A series, as shown on Table 1.8.1. The method for
designating options differs according to the specific model.
Table 1.8.1 MB90660A Series Mask Option List
Note 1:
Asynchronous receiving of reset input signal is a function that allows a reset signal to be received
in cases when oscillator output to output ports (including peripheral resource outputs) is stopped,
and forcibly places port output signals (including peripheral resource outputs) in Hi-Z state.
Note, however, that internal reset signals (for CPU or peripheral resources, etc.) are clock-
synchronous, and therefore the CPU and peripheral resources are not initialized when the clock
signal is stopped.
Note 2:
For details about mask ordering and options, see the ROM Ordering Specifications.
Note 3:
In relation to writing to the MB90P663A, see chapter 6 “MB90P663A Specifications.”
Note 4:
Pin-by-pin pull-up/pull-down resistor selection is not available for the mode pins (MD2 to MD0).
The ‘yes’ selection for mask ROM versions includes MD0/MD1 with pull-up resistor, and MD2
with pull-down resistor, and for OTP versions includes MD0/MD1 with pull-up resistor, but MD2
without pull-down resistor.
Note 5:
The MB90P633A requires 8 machine cycles for option setting, so that no option settings may be
entered between power-on and the start of clock signal supply. (This assumes all pins have no pull-
up resistor, and asynchronous receiving of reset input is enabled.)
No.
Description
MB90662A
MB90663A
MB90P663A
MB90V660A
Method of
selection
Select when ordering mask
Set using EPROM programmer
No setting
available
1
P00 to P07
P10 to P17
P20 to P27
P30 to P33
P40 to P47
P60 to P66
RSTX
DTTI
Pull-up resistor available for indi-
vidual pins
Pull-up resistor available for indi-
vidual pins
No selection.
Pull-up resistor
not available.
2
MD2
Pull-down
resistor
Blanket selec-
tion available
No selection. Pull-down resistor
not available
No selection.
Pull-up or pull-
down resistor
not available
MD1
Pull-up resistor
Blanket selec-
tion available
MD0
Pull-up resistor
3
Asynchronous
receiving of
reset input sig-
nal
Enabled
Disabled
Selection available
No selection.
Receiving
enabled.