MC68HC16Z1CPV16 Datasheet, PDF (388/500 Pages) Freescale Semiconductor, Inc – Symbols and Operators, CPU16 Register Mnemonics

Freescale Semiconductor, Inc.
PIV[7:0] — Periodic Interrupt Vector
This field specifies the periodic interrupt vector number supplied by the SIM when the
CPU16 acknowledges an interrupt request.
D.2.14 Periodic Interrupt Timer Register
PITR — Periodic Interrupt Timer Register
$YFFA24
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
PTP
PITM[7:0]
RESET:
0
0
0
0
0
0
0 MODCLK 0
0
0
0
0
0
0
0
Contains the count value for the periodic timer. This register can be read or written at
any time.
PTP — Periodic Timer Prescaler
0 = Periodic timer clock not prescaled.
1 = Periodic timer clock prescaled by a value of 512.
PITM[7:0] — Periodic Interrupt Timing Modulus
This field determines the periodic interrupt rate. Use the following equations to calcu-
late timer period.
The following equation calculates the PIT period when a slow reference frequency is
used:
PIT Period = ⁽---^P----^I--^T---^M-----^[--⁷---^:--⁰---^]--⁾---⁽--¹-----ⁱ-^f----^P----^T---^P----_f--⁼_r--_e---_f⁰----^,---⁵---¹----²-----ⁱ-^f---^P----^T----^P-----⁼------¹---⁾---⁽--⁴----⁾-
The following equation calculates the PIT period when a fast reference frequency is
used:
PIT Period = ⁽---¹---²----⁸---⁾---⁽--^P----^I--^T---^M-----^[--⁷---^:--⁰---^]--⁾---⁽--¹-----ⁱ--^f---^P----^Tf--_r--^P_e--_f---⁼-----⁰----^,---⁵---¹----²-----ⁱ-^f---^P----^T----^P------⁼-----¹----⁾--⁽---⁴---⁾-
The following equation calculates the PIT period for an externally input clock frequen-
cy on both slow and fast reference frequency devices.
PIT Period = ⁽---^P----^I--^T---^M-----^[--⁷---^:--⁰---^]--⁾---⁽--¹-----ⁱ-^f----^P----^T---^P----_f--_s⁼--_y---_s⁰----^,---⁵---¹----²-----ⁱ-^f---^P----^T----^P-----⁼------¹---⁾---⁽--⁴----⁾-
D-14
REGISTER SUMMARY
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