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| 型號(hào)： | L8708H |
| 廠商： | ZiLOG, Inc. |
| 英文描述： | IR/Low-Voltage Microcontroller |
| 中文描述： | 紅外/低電壓微控制器 |
| 文件頁(yè)數(shù)： | 47/66頁(yè) |
| 文件大?。?/td> | 599K |
| 代理商： | L8708H |
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Z86L88/81/86/87/89/73
IR/Low-Voltage Microcontroller
DS96LV00800
P R E L I M I N A R Y
47
1
Power-On Reset
(POR). A timer circuit clocked by a ded-
icated on-board RC oscillator is used for the Power-On Re-
set (POR) timer function. The POR time allows V
CC
and
the oscillator circuit to stabilize before instruction execu-
tion begins.
The POR timer circuit is a one-shot timer triggered by one
of three conditions:
1.
Power Fail to Power OK status including Waking up
from (V
LV
Standby).
2.
Stop-Mode Recovery (if D5 of SMR = 1).
3.
WDT Time-Out.
The POR time is a nominal 5 ms. Bit 5 of the Stop-Mode
Register determines whether the POR timer is bypassed
after Stop-Mode Recovery (typical for external clock, RC,
LC oscillators).
HALT.
HALT turns off the internal CPU clock, but not the
XTAL oscillation. The counter/timers and external inter-
rupts IRQ0, IRQ1, IRQ2, IRQ3, and IRQ4 remain active.
The devices are recovered by interrupts, either externally
or internally generated. An interrupt request must be exe-
cuted (enabled) to exit HALT mode. After the interrupt ser-
vice routine, the program continues from the instruction af-
ter the HALT.
STOP.
This instruction turns off the internal clock and ex-
ternal crystal oscillation and reduces the standby current
to 10
μ
A or less. STOP mode is terminated only by a reset,
such as WDT time-out, POR, SMR, or external reset. This
causes the processor to restart the application program at
address 000CH. In order to enter STOP (or HALT) mode,
it is necessary to first flush the instruction pipeline to avoid
suspending execution in mid-instruction. To do this, the
user must execute a NOP (opcode = FFH) immediately be-
fore the appropriate sleep instruction, i.e.,
FF
6F
NOP
STOP
; clear the pipeline
; enter STOP mode
or
; clear the pipeline
; enter HALT mode
FF
7F
NOP
HALT
Figure 37. Oscillator Configuration
XTAL1
XTAL2
C1
C2
C1
C2
C1
XTAL1
XTAL2
XTAL1
XTAL2
XTAL1
XTAL2
Ceramic Resonator or Crystal
C1, C2 = 47 pF TYP *
f = 8 MHz
LC
C1, C2 = 22 pF
L = 130
μ
H *
f = 3 MHz *
RC
@ 3V VCC (TYP)
C1 = 33 pF *
R = 1K *
External Clock
L
R
* Preliminary value including pin parasitics
C1
32 kHz XTAL
C1 = 20 pF, C = 33
pF
Rd = 56 - 470K
Rf =10 M
Rf
C2
Rd
XTAL1
XTAL2
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