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8XC196MC, MD, MH USER’S MANUAL
5-12
5.5 PROGRAMMING THE INTERRUPTS
The PTS select register (PTSSEL) selects either PTS service or a standard software interrupt ser-
vice routine for each of the maskable interrupt requests (see Figure 5-6). The bits in the interrupt
mask registers, INT_MASK and INT_MASK1, enable or disable (mask) individual interrupts
(see Figures 5-7 and 5-8). For the multiplexed interrupt sources, bits in the PI_MASK register
(Figure 5-9 on page 5-17) enable or disable (mask) the individual interrupt sources. With the ex-
ception of the nonmaskable interrupt (NMI) bit (INT_MASK1.7), setting a bit enables the corre-
sponding interrupt source and clearing a bit disables the source.
To disable any interrupt, clear its mask bit. To enable an interrupt for standard interrupt service,
set its mask bit and clear its PTS select bit. To enable an interrupt for PTS service, set both the
mask bit and the PTS select bit.
Table 5-4. Execution Times for PTS Cycles
PTS Mode Execution Time (in State Times)
Single transfer mode
register/register
†
memory/register
†
memory/memory
†
18 per byte or word transfer + 1
21 per byte or word transfer + 1
24 per byte or word transfer + 1
Block transfer mode
register/register
†
memory/register
†
memory/memory
†
13 + 7 per byte or word transfer (1 minimum)
16 + 7 per byte or word transfer (1 minimum)
19 + 7 per byte or word transfer (1 minimum)
A/D scan mode
register/register
†
register/memory
†
21
25
ASIO receive mode (MC, MD only)
Majority disabled
Majority enabled
24 + 2 (if parity enabled)
36 + sample time (second sample)
36 + 7 + sample time (third sample)
36 + 2 (if parity enabled)
ASIO transmit mode (MC, MD only) 29 + 3 (if parity enabled)
SSIO receive mode (MC, MD only) 29 (receive data bit)
21 (no reception)
SSIO transmit mode (MC, MD only) 30 (transmit data bit)
20 (no transmission)
†
Register
indicates an access to the register file or peripheral SFR.
Memory
indicates an access to a
memory-mapped register, I/O, or memory. See Table 4-1 on page 4-2 for address information.