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參數資料
| 型號： | COP87L88RGV-XE |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit One-Time Programmable (OTP) Microcontroller with 32 Kbytes of Program Memory |
| 中文描述： | 8-BIT, OTPROM, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數： | 8/34頁 |
| 文件大?。?/td> | 385K |
| 代理商： | COP87L88RGV-XE |
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Reset
(Continued)
error will cause an active low error output on pin G1. This
error output will continue until 16–32 t
c
clock cycles follow-
ing the clock frequency reaching the minimum specified val-
ue, at which time the G1 output will enter the TRI-STATE
mode.
The external RC network shown inFigure 4 should be used
to ensure that the RESET pin is held low until the power
supply to the chip stabilizes.
Note:
In continual state of reset, the device will draw excessive current.
TL/DD/12524–6
RC
l
5
c
Power Supply Rise Time
FIGURE 4. Recommended Reset Circuit
Oscillator Circuits
The chip can be driven by a clock input on the CKI input pin
which can be between DC and 10 MHz. The CKO output
clock is on pin G7 (crystal configuration). The CKI input fre-
quency is divided down by 10 to produce the instruction
cycle clock (1/t
c
).
Figure 5 shows the Crystal and R/C diagrams.
TL/DD/12524–7
FIGURE 5. Crystal and R/C Oscillator Diagrams
CRYSTAL OSCILLATOR
CKI and CKO can be connected to make a closed loop
crystal (or resonator) controlled oscillator.
Table I shows the component values required for various
standard crystal values.
TABLE I. Crystal Oscillator Configuration, T
A
e
25
§
C
R1
(k
X
)
R2
(M
X
)
C1
(pF)
C2
(pF)
CKI Freq
(MHz)
Conditions
0
1
30
30–36
10
V
CC
e
5V
0
1
30
30–36
4
V
CC
e
5V
0
1
200
100–150
0.455
V
CC
e
5V
R/C OSCILLATOR
By selecting CKI as a single pin oscillator input, a single pin
R/C oscillator circuit can be connected to it. CKO is avail-
able as a general purpose input, and/or HALT restart pin.
Table II shows the variation in the oscillator frequencies as
functions of the component (R and C) values.
TABLE II. R/C Oscillator Configuration, T
A
e
25
§
C
R
C
CKI Freq
(MHz)
Instr. Cycle
(
m
s)
Conditions
(k
X
)
(pF)
3.3
82
2.2–2.7
3.7–4.6
V
CC
e
5V
5.6
100
1.1–1.3
V
CC
e
5V
6.8
100
0.9–1.1
8.8–10.8
V
CC
e
5V
Note:
3k
s
R
s
200k, 50 pF
s
C
s
200 pF
Control Registers
CNTRL Register (Address X
ê
00EE)
The Timer1 (T1) and MICROWIRE/PLUS control register
contains the following bits:
SL1 & SL0 Select the MICROWIRE/PLUS clock divide
by (00
e
2, 01
e
4, 1x
e
8)
IEDG
External interrupt edge polarity select
(0
e
Rising edge, 1
e
Falling edge)
MSEL
Selects G5 and G4 as MICROWIRE/PLUS
signals
SK and SO respectively
http://www.national.com
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