Z86C83 Zilog., Z86C83 Datasheet - Page 33

• Manufacturer Part Number: Z86C83
• Description: Z8 MCU MICROCONTROLLERS
• Manufacturer: Zilog.

Z86C83/C84
Z8
FUNCTIONAL DESCRIPTION (Continued)
Power-On Reset (POR). A timer circuit clocked by a
dedicated on-board RC oscillator or by the XTAL oscillator
is used for the POR timer function. The POR time allows
V
execution begins. The POR timer circuit is a one-shot timer
triggered by one of three conditions:
The POR time is T
Register determines whether the POR timer is bypassed
after Stop-Mode Recovery (typical for external clock, and
RC/LC oscillators with fast start up time).
33
CC
®
and the oscillator circuit to stabilize before instruction
MCU Microcontrollers
Power Fail to Power OK Status
Stop-Mode Recovery (If D5 of SMR Register = 1)
WDT Time-Out (Including from Stop Mode)
VDLO
DAC Output in Volts
VDHI
3.5V
POR
1.26
2.15
1.7
.8
minimum. Bit 5 of the STOP Mode
0
Notes:
Vcc = 5.0V 10%
VDHI = 3.5V
VDLO = 0.8V
1/4X
1/2X
2% accuracy
1X
Figure 33. Gain Control on DAC
DAC Data Register Value
80H
HALT. Turns off the internal CPU clock but not the XTAL
oscillation. The counter/timers and external interrupts
IRQ0, IRQ1, and IRQ2 remain active. The device is
recovered by interrupts, either externally or internally
generated (a POR or a WDT time-out). An interrupt
request must be executed (enabled) to exit HALT mode.
After the interrupt service routine, the program continues
from the instruction after the HALT. In case of a POR or a
WDT time-out, program execution will restart at address
000CH.
STOP. This instruction turns off the internal clock and
external crystal oscillation and reduces the standby
current to 10
terminated by a reset of either WDT time-out, POR, or
Stop-Mode Recovery. This causes the processor to restart
the application program at address 000CH.
A (typical) or less. The STOP mode is
FFH
2.6
3.5
3.05
2.15
DS96DZ80203