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COP87L84 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # COP87L84
Description  8-Bit CMOS OTP Microcontrollers with 16k Memory, Comparators, and CAN Interface
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

COP87L84 Datasheet(HTML) 11 Page - National Semiconductor (TI)

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Oscillator Circuits (Continued)
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.
TABLE 1. Crystal Oscillator Configuration, T
A = 25˚C
R1
R2
C1
C2
CKI Freq.
Conditions
(k
Ω)(MΩ)
(pF)
(pF)
(MHz)
0
1
30
30–36
10
V
CC =5V
0
1
30
30–36
4
V
CC =5V
0
1
200
100–150
0.455
V
CC =5V
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.
ICNTRL Register (Address X'00E8)
Reserved
LPEN
T0PND
T0EN
µWPND
µWEN
T1PNDB
T1ENB
Bit 7
Bit 0
The ICNTRL register contains the following bits:
Reserved This bit is reserved and must be zero.
LPEN
L Port Interrupt Enable (Multi-Input Wakeup/
Interrupt)
T0PND
Timer T0 Interrupt pending
T0EN
Timer T0 Interrupt Enable (Bit 12 toggle)
µWPND
MICROWIRE/PLUS interrupt pending
µWEN
Enable MICROWIRE/PLUS interrupt
T1PNDB
Timer T1 Interrupt Pending Flag for T1B cap-
ture edge
T1ENB
Timer T1 Interrupt Enable for T1B Input cap-
ture edge
Timers
The device contains a very versatile set of timers (T0, T1,
and an 8-bit PWM timer). All timers and associated
autoreload/capture registers power up containing random
data.
Figure 8 shows a block diagram for timers T1 and T0 on the
device.
TIMER T0 (IDLE TIMER)
The device supports applications that require maintaining
real time and low power with the IDLE mode. This IDLE
mode support is furnished by the IDLE timer T0, which is a
16-bit timer. The Timer T0 runs continuously at the fixed rate
of the instruction cycle clock, t
c. The user cannot read or
write to the IDLE Timer T0, which is a count down timer.
The Timer T0 supports the following functions:
Exit out of the Idle Mode (See Idle Mode description)
Start up delay out of the HALT mode
The IDLE Timer T0 can generate an interrupt when the thir-
teenth bit toggles. This toggle is latched into the T0PND
pending flag, and will occur every 4.096 ms at the maximum
clock frequency (t
c = 1 µs). A control flag T0EN allows the in-
terrupt from the thirteenth bit of Timer T0 to be enabled or
disabled. Setting T0EN will enable the interrupt, while reset-
ting it will disable the interrupt.
TIMER T1
The device has a powerful timer/counter block, T1.
The timer block consists of a 16-bit timer, T1, and two sup-
porting 16-bit autoreload/capture registers, R1A and R1B.
The timer block has two pins associated with it, T1A and
T1B. The pin T1A supports I/O required by the timer block,
DS101137-7
FIGURE 7. Crystal Oscillator Diagram
www.national.com
11


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