z86d73 ZiLOG Semiconductor, z86d73 Datasheet - Page 73

• Manufacturer Part Number: z86d73
• Description: 40/44/48-pin Low-voltage
• Manufacturer: ZiLOG Semiconductor

PS019402-1103
Mask Selectable Options
There are seven Mask Selectable Options to choose from based on ROM code
requirements. These are listed in Table 19.
Table 19. Mask Selectable Options
Brown-Out Voltage/Standby
An on-chip Voltage Comparator checks that the V
correct operation of the device. Reset is globally driven when V
A small drop in V
resonator clock. Typical Low-Voltage power consumpion in this Low Voltage
Standby mode (I
RAM content is preserved. When the power level is returned to above V
device performs a POR and functions normally.
Low-Voltage Detection and Flag
A Low-Voltage Detection circuit can be used optionally when the voltage
decreases to V
used for this option. Bit D0 is used to enable/disable this function; bit D1 is the sta-
tus flag bit of the LVD.
RC/Other
32 kHz XTAL
Port 00–03 Pull-Ups
Port 04–07 Pull-Ups
Port 10–13 Pull-Ups
Port 14–17 Pull-Ups
Port 20–27 Pull-Ups
Port 3: Pull-Ups
Port 0: 0–3 Normal Mode (0.5 V
(0.4 V
DD
Input Threshold)
LVD
LV
CC
) is about 20 µA. If the V
. Expanded Register Bank
P
causes the XTAL1 and XTAL2 circuitry to stop the crystal or
R
E
L
DD
I
Input Threshold) versus Mouse Mode
M
I
N
CC
A
0Dh
is allowed to stay above Vram, the
40/44/48-Pin Low-Voltage IR OTP
R
CC
register
Y
is at the required level for
0Ch
CC
bits 0 and 1 are
falls below V
RC/XTAL
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
On/Off
BO
Z86D73
, the
BO
.
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