cop87l88rd National Semiconductor Corporation, cop87l88rd Datasheet - Page 11

• Manufacturer Part Number: cop87l88rd
• Description: 8-bit Cmos Otp Microcontrollers With 16k Or 32k Memory And 8-channel A/d With Prescaler
• Manufacturer: National Semiconductor Corporation

Oscillator Circuits
Note 14: 3k
CONTROL REGISTERS
CNTRL Register (Address X'00EE)
The Timer1 (T1) and MICROWIRE/PLUS control register
contains the following bits:
Bit 7
(k )
T1C3
(k )
TABLE 1. Crystal Oscillator Configuration, T
3.3
5.6
6.8
R1
T1C3
T1C2
T1C1
T1C0
MSEL
IEDG
R
0
0
0
TABLE 2. RC Oscillator Configuration, T
FIGURE 7. Crystal and R/C Oscillator Diagrams
(M )
T1C2
(pF)
50 pF
100
100
R2
82
C
1
1
1
R
200k
C
T1C1
Timer T1 mode control bit
Timer T1 mode control bit
Timer T1 mode control bit
Timer T1 Start/Stop control in timer
modes 1 and 2, T1 Underflow Interrupt
Pending Flag in timer mode 3
Selects G5 and G4 as MICROWIRE/PLUS
signals SK and SO respectively
External interrupt edge polarity select
(0 = Rising edge, 1 = Falling edge)
(pF)
200
C1
2.2 to 2.7
1.1 to 1.3
0.9 to 1.1
30
30
CKI Freq
(MHz)
200 pF
100–150
T1C0
30–36
30–36
(pF)
C2
MSEL
Instr. Cycle
DS012526-9
DS012526-8
(Continued)
8.8 to 10.8
3.7 to 4.6
7.4 to 9.0
CKI Freq
(µs)
(MHz)
0.455
10
4
IEDG
Conditions
SL1
Conditions
A
V
V
V
V
V
V
CC
CC
CC
A
= 25˚C
CC
CC
CC
= 25˚C
= 5V
= 5V
= 5V
= 5V
= 5V
= 5V
SL0
Bit 0
11
PSW Register (Address X'00EF)
The PSW register contains the following select bits:
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)
The ICNTRL register contains the following bits:
T2CNTRL Register (Address X'00C6)
The T2CNTRL control register contains the following bits:
Reserved
Bit 7
Bit 7
T2C3
Bit 7
HC
SL1 & SL0
HC
C
T1PNDA Timer T1 Interrupt Pending Flag (Autoreload
T1ENA
EXPND
BUSY
EXEN
GIE
Reserved This bit is reserved and should to zero
LPEN
T0PND
T0EN
µWPND
µWEN
T1PNDB
T1ENB
T2C3
T2C2
T2C1
T2C0
T2PNDA
T2ENA
T2PNDB
C
T2C2
LPEN
T1PNDA
Half Carry Flag
Carry Flag
RA in mode 1, T1 Underflow in Mode 2, T1A
capture edge in mode 3)
Timer T1 Interrupt Enable for Timer Underflow
or T1A Input capture edge
External interrupt pending
MICROWIRE/PLUS busy shifting flag
Enable external interrupt
Global interrupt enable (enables interrupts)
L Port Interrupt Enable (Multi-Input Wakeup/
Interrupt)
Timer T0 Interrupt pending
Timer T0 Interrupt Enable (Bit 12 toggle)
MICROWIRE/PLUS interrupt pending
Enable MICROWIRE/PLUS interrupt
Timer T1 Interrupt Pending Flag for T1B cap-
ture edge
Timer T1 Interrupt Enable for T1B Input cap-
ture edge
Timer T2 mode control bit
Timer T2 mode control bit
Timer T2 mode control bit
Timer
modes 1 and 2, T2 Underflow Interrupt Pend-
ing Flag in timer mode 3
Timer T2 Interrupt Pending Flag (Autoreload
RA in mode 1, T2 Underflow in mode 2, T2A
capture edge in mode 3)
Timer T2 Interrupt Enable for Timer Underflow
or T2A Input capture edge
Timer T2 Interrupt Pending Flag for T2B cap-
ture edge
T2C1
Select the MICROWIRE/PLUS clock divide
by (00 = 2, 01 = 4, 1x = 8)
T0PND
T2C0
T1ENA
T2
T0EN
T2PNDA
Start/Stop
EXPND
µWPND
T2ENA
µWEN
BUSY
control
T2PNDB
T1PNDB
EXEN
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in
T2ENB
T1ENB
timer
Bit 0
GIE
Bit 0
Bit 0