mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 393

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

PITR — Periodic Interrupt Timer Register
D.2.16 Periodic Interrupt Control Register
PICR — Periodic Interrupt Control Register
PIRQL[2:0] — Periodic Interrupt Request Level
PIV[7:0] — Periodic Interrupt Vector
D.2.17 Periodic Interrupt Timer Register
PTP — Periodic Timer Prescaler
PITM[7:0] — Periodic Interrupt Timing Modulus
MC68HC16Y3/916Y3
USER’S MANUAL
15
15
0
0
0
0
RESET:
RESET:
PICR sets the interrupt level and vector number for the periodic interrupt timer (PIT).
Bits [10:0] can be read or written at any time. Bits [15:11] are unimplemented and
always read zero.
This field determines the priority of periodic interrupt requests. A value of %000
disables PIT interrupts.
This field specifies the periodic interrupt vector number supplied by the SCIM2 when
the CPU16 acknowledges an interrupt request.
Contains the count value for the periodic timer. This register can be read or written at
any time.
This field determines the periodic interrupt rate. Use the following equations to
calculate timer period.
The following equation calculates the PIT period when a slow reference frequency is
used:
0 = Periodic timer clock not prescaled.
1 = Periodic timer clock prescaled by a value of 512.
14
14
0
0
0
0
13
13
0
0
0
0
12
12
0
0
0
0
Freescale Semiconductor, Inc.
Table D-7 Bus Monitor Timeout Period
11
11
0
0
0
0
For More Information On This Product,
BMT[1:0]
00
01
10
11
10
10
0
0
0
PIRQL[2:0]
Go to: www.freescale.com
REGISTER SUMMARY
9
0
0
9
0
Bus Monitor Timeout Period
MODCLK
PTP
8
0
8
64 System clocks
32 System clocks
16 System clocks
8 System clocks
7
0
7
0
6
0
6
0
5
0
5
0
4
0
4
0
PIV[7:0]
PITM[7:0]
3
1
3
0
2
1
2
0
$YFFA24
$YFFA22
MOTOROLA
1
1
1
0
D-15
0
1
0
0