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8XC196NT USER'S MANUAL
NMI, 5-3, 5-4, 5-6, B-8
and bus-hold protocol, 14-22
hardware considerations, 5-6
idle, powerdown, reset status, B-15
Noise, reducing, 6-2, 6-3, 6-6, 11-3, 11-13, 11-14,
12-4, 12-5, 12-6
Nonextended addressing, 4-24
NOP instruction, 3-14, A-3, A-31, A-51, A-58,
A-66
two-byte‚ See SKIP instruction
NORML instruction, 3-5, A-3, A-31, A-46, A-58,
A-65
NOT instruction, A-2, A-32, A-46, A-53, A-60
Notational conventions, 1-3–1-4
NOTB instruction, A-2, A-32, A-46, A-53, A-60
Numbers, conventions, 1-4
O
OBF flag, C-51
OFD bit, 15-7, 15-8
ONCE mode, 2-10, 13-9
entering, 13-9
exiting, 13-9
Opcodes, A-46
EE, and unimplemented opcode interrupt,
A-3, A-51
FE, and signed multiply and divide, A-3
map, A-2
reserved, A-3, A-51
Operand types, See data types
Operands, addressing, 3-12
Operating modes, 2-10
See also 1-Mbyte mode, 64-Kbyte mode
OR instruction, A-2, A-32, A-48, A-53, A-60
ORB instruction, A-2, A-32, A-48, A-53, A-60
Oscillator
and powerdown mode, 13-4
detecting failure, 12-9, 12-12
external crystal, 12-7
on-chip, 12-5
OTPROM
controlling access to internal memory,
15-3–15-6
controlling fetches from external memory,
15-6–15-7
enabling oscillator failure detection circuitry,
15-7
Index-8
memory map, 15-2
programming, 15-1–15-44
See also programming modes
ROM-dump mode, 15-30
verifying, 15-30
Overflow (V) flag, A-4, A-5, A-25, A-26
Overflow-trap (VT) flag, A-4, A-5, A-11, A-26,
A-27
P
P0.4–P0.7
and programming modes, 15-14
idle, powerdown, reset status, B-14
See also port 0
P0_PIN, C-67
P1.0–P1.7, B-8
idle, powerdown, reset status, B-14
See also port 1
P1_DIR, C-67
P1_MODE, C-67
P1_PIN, C-67
P1_REG, C-67
P2.0–P2.7, B-9
idle, powerdown, reset status, B-14
See also port 2
P2.2 considerations, 13-7
P2.7 reset status, 6-6
P2_DIR, C-67
P2_MODE, C-67
P2_PIN, C-67
P2_REG, C-68
P3.0–P3.7, B-9
idle, powerdown, reset status, B-14
See also port 3
P4.0–P4.7, B-9
idle, powerdown, reset status, B-14
See also port 4
P5.0–P5.7, B-9
idle, powerdown, reset status, B-14
See also port 5
P6.0–P6.7, B-9
idle, powerdown, reset status, B-14
See also port 6
P6_DIR, C-68
P6_MODE, C-68
P6_PIN, C-68
P6_REG, C-68
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