參數(shù)資料
型號： COPCSH984XXX/WM
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDSO28
封裝： SOIC-28
文件頁數(shù)： 10/60頁
文件大?。?/td> 693K
代理商： COPCSH984XXX/WM
Reset (Continued)
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 7 shows the Crystal and R/C oscillator diagrams.
CRYSTAL OSCILLATOR
CKI and CKO can be connected to make a closed loop crys-
tal (or resonator) controlled oscillator.
Table 1 shows the component values required for various
standard crystal values.
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 available
as a general purpose input, and/or HALT restart input.
Table 2 shows the variation in the oscillator frequencies as
functions of the component (R and C) values.
TABLE 1. Crystal Oscillator Configuration, T
A = 25C
R1
R2
C1
C2
CKI Freq
Conditions
(k
)(M) (pF)
(pF)
(MHz)
0
1
30
30–36
10
V
CC =5V
R1
R2
C1
C2
CKI Freq
Conditions
(k
)(M) (pF)
(pF)
(MHz)
0
1
30
30–36
4
V
CC =5V
0
1
200
100–150
0.455
V
CC = 2.5V
TABLE 2. RC Oscillator Configuration, T
A = 25C
R
C
CKI Freq
Instr. Cycle
Conditions
(k
)
(pF)
(MHz)
(s)
3.3
82
2.2 to 2.7
3.7 to 4.6
V
CC =5V
5.6
100
1.1 to 1.3
7.4 to 9.0
V
CC =5V
6.8
100
0.9 to 1.1
8.8 to 10.8
V
CC =5V
Note: 3k
≤ R ≤ 200k
50 pF
≤ C ≤ 200 pF
CONTROL REGISTERS
CNTRL Register (Address X'00EE)
T1C3
T1C2
T1C1
T1C0
MSEL
IEDG
SL1
SL0
Bit 7
Bit 0
The Timer1 (T1) and MICROWIRE/PLUS control register
contains the following bits:
T1C3
Timer T1 mode control bit
T1C2
Timer T1 mode control bit
T1C1
Timer T1 mode control bit
T1C0
Timer T1 Start/Stop control in timer
modes 1 and 2, T1 Underflow Interrupt
Pending Flag in timer mode 3
MSEL
Selects G5 and G4 as MICROWIRE/PLUS
signals SK and SO respectively
IEDG
External interrupt edge polarity select
(0 = Rising edge, 1 = Falling edge)
SL1 & SL0
Select the MICROWIRE/PLUS clock divide
by (00 = 2, 01 = 4, 1x = 8)
PSW Register (Address X'00EF)
HC
C
T1PNDA
T1ENA
EXPND
BUSY
EXEN
GIE
Bit 7
Bit 0
The PSW register contains the following select bits:
HC
Half Carry Flag
C
Carry Flag
T1PNDA Timer T1 Interrupt Pending Flag (Autoreload
RA in mode 1, T1 Underflow in Mode 2, T1A
capture edge in mode 3)
T1ENA
Timer T1 Interrupt Enable for Timer Underflow
or T1A Input capture edge
EXPND
External interrupt pending
BUSY
MICROWIRE/PLUS busy shifting flag
EXEN
Enable external interrupt
GIE
Global interrupt enable (enables interrupts)
The Half-Carry flag is also affected by all the instructions that
affect the Carry flag. The SC (Set Carry) and R/C (Reset
Carry) instructions will respectively set or clear both the carry
flags. In addition to the SC and R/C instructions, ADC,
SUBC, RRC and RLC instructions affect the Carry and Half
Carry flags.
DS012829-7
RC > 5 x Power Supply Rise Time
FIGURE 6. Recommended Reset Circuit
DS012829-8
DS012829-9
FIGURE 7. Crystal and R/C Oscillator Diagrams
COP888xG/CS
Family
www.national.com
18
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