COP8SBR9 NSC [National Semiconductor], COP8SBR9 Datasheet - Page 25

• Manufacturer Part Number: COP8SBR9
• Description: 8-Bit CMOS Flash Based Microcontroller with 32k Memory, Virtual EEPROM and Brownout
• Manufacturer: NSC [National Semiconductor]

10.0 Functional Description
10.9 CONTROL REGISTERS
10.9.1 CNTRL Register (Address X'00EE)
The Timer1 (T1) and MICROWIRE/PLUS control register
contains the following bits:
10.9.2 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
Bit 7
T1C3
Bit 7
T1C3
T1C2
T1C1
T1C0
MSEL
IEDG
SL1 & SL0 Select the MICROWIRE/PLUS clock divide
HC
C
T1PNDA Timer T1 Interrupt Pending Flag (Autoreload RA
T1ENA
EXPND
BUSY
EXEN
GIE
HC
T1C2
C
Half Carry Flag
Carry Flag
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)
T1PNDA
Timer T1 mode control bit
Timer T1 mode control bit
Timer T1 mode control bit
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
(0 = Rising edge, 1 = Falling edge)
by (00 = 2, 01 = 4, 1x = 8)
T1C1
High Speed Oscillator
T1ENA
T1C0
T1
interrupt
Start/Stop
MSEL
EXPND
10138915
edge
IEDG
BUSY
control
polarity
SL1
FIGURE 12. Crystal Oscillator
EXEN
(Continued)
in
select
SL0
timer
Bit 0
GIE
Bit 0
25
flags. In addition to the SC and R/C instructions, ADC,
SUBC, RRC and RLC instructions affect the Carry and Half
Carry flags.
10.9.3 ICNTRL Register (Address X'00E8)
The ICNTRL register contains the following bits:
10.9.4 T2CNTRL Register (Address X'00C6)
The T2CNTRL register contains the following bits:
Bit 7
Bit 7
Unused
T2C3
LPEN
T0PND
T0EN
µWPND MICROWIRE/PLUS interrupt pending
µWEN
T1PNDB Timer T1 Interrupt Pending Flag for T1B capture
T1ENB
T2C3
T2C2
T2C1
T2C0
T2PNDA Timer T2 Interrupt Pending Flag (Autoreload
T2ENA
T2PNDB Timer T2 Interrupt Pending Flag for T2B cap-
T2ENB
T2C2
LPEN
L
Wake-up/Interrupt)
Timer T0 Interrupt pending
Timer T0 Interrupt Enable (Bit 12 toggle)
Enable MICROWIRE/PLUS interrupt
edge
Timer T1 Interrupt Enable for T1B Input capture
edge
Timer T2 mode control bit
Timer T2 mode control bit
Timer T2 mode control bit
Timer
modes 1 and 2, Timer T2 Underflow Interrupt
Pending Flag in timer mode 3
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
ture edge
Timer T2 Interrupt Enable for T2B Input capture
edge
T2C1
T0PND
Low Speed Oscillator
Port
T2
T2C0
T0EN
Interrupt
Start/Stop
T2PNDA
µWPND
10138916
Enable
T2ENA
µWEN
control
T2PNDB
T1PNDB
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(Multi-Input
in
T2ENB
T1ENB
timer
Bit 0
Bit 0