Intel 80C196NU ユーザーズマニュアル
6-19
STANDARD AND PTS INTERRUPTS
6.6.2
Selecting the PTS Mode
The second byte of each PTSCB is always an 8-bit value called PTSCON. Bits 5–7 select the PTS
mode (Figure 6-11). The function of bits 0–4 differ for each PTS mode. Refer to the sections that
describe each mode in detail to see the function of these bits. Table 6-4 on page 6-10 lists the cycle
execution times for each PTS mode.
mode (Figure 6-11). The function of bits 0–4 differ for each PTS mode. Refer to the sections that
describe each mode in detail to see the function of these bits. Table 6-4 on page 6-10 lists the cycle
execution times for each PTS mode.
PTSSRV
Address:
Reset State:
0006H
0000H
0000H
The PTS service (PTSSRV) register is used by the hardware to indicate that the final PTS interrupt
has been serviced by the PTS routine. When PTSCOUNT reaches zero, hardware clears the corre-
sponding PTSSEL bit and sets the PTSSRV bit, which requests the end-of-PTS interrupt. When the
end-of-PTS interrupt is called, hardware clears the PTSSRV bit. The PTSSEL bit must be set
manually to re-enable the PTS channel.
has been serviced by the PTS routine. When PTSCOUNT reaches zero, hardware clears the corre-
sponding PTSSEL bit and sets the PTSSRV bit, which requests the end-of-PTS interrupt. When the
end-of-PTS interrupt is called, hardware clears the PTSSRV bit. The PTSSEL bit must be set
manually to re-enable the PTS channel.
15
8
—
EXTINT3
EXTINT2
OVR2_3
OVR0_1
EPA3
EPA2
EPA1
7
0
EPA0
RI
TI
EXTINT1
EXTINT0
—
OVRTM1
OVRTM2
Bit
Number
Function
15, 2
Reserved. These bits are undefined.
14:3
1:0
1:0
A bit is set by hardware to request an end-of-PTS interrupt for the corresponding interrupt
through its standard interrupt vector.
through its standard interrupt vector.
The standard interrupt vector locations are as follows.
Bit Mnemonic
Interrupt
Standard Vector
EXTINT3
EXTINT3 Pin
FF203CH
EXTINT2
EXTINT2 Pin
FF203AH
OVR2_3
†
EPA Capture Channel 2 or 3 Overrun
FF2038H
OVR0_1
†
EPA Capture Channel 0 or 1 Overrun
FF2036H
EPA3
EPA Capture/Compare Channel 3
FF2034H
EPA2
EPA Capture/Compare Channel 2
FF2032H
EPA1
EPA Capture/Compare Channel 1
FF2030H
EPA0
EPA Capture/Compare Channel 0
FF200EH
RI
SIO Receive
FF200CH
TI
SIO Transmit
FF200AH
EXTINT1
EXTINT1 pin
FF2008H
EXTINT0
EXTINT0 pin
FF2006H
OVRTM2
Timer 2 Overflow/Underflow
FF2002H
OVRTM1
Timer 1 Overflow/Underflow
FF2000H
†
PTS service is not recommended for multiplexed interrupts. This bit is cleared when
both corresponding interrupt pending bits are cleared in EPA_PEND.
Figure 6-10. PTS Service (PTSSRV) Register