S912XHZ512F1VAG Datasheet, PDF (635/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

Chapter 17 Periodic Interrupt Timer (S12PIT24B4CV1)
17.3.0.9 PIT Count Register 0 to 3 (PITCNT0–3)
Module Base + 0x000A, 0x000B
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R _{PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT}
W ¹⁵
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reset 0
0
0
0
0
0
0000000000
Figure 17-15. PIT Count Register 0 (PITCNT0)
Module Base + 0x000E, 0x000F
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R _{PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT}
W ¹⁵
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reset 0
0
0
0
0
0
0000000000
Figure 17-16. PIT Count Register 1 (PITCNT1)
Module Base + 0x0012, 0x0013
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R _{PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT}
W ¹⁵
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reset 0
0
0
0
0
0
0000000000
Figure 17-17. PIT Count Register 2 (PITCNT2)
Module Base + 0x0016, 0x0017
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R _{PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT PCNT}
W ¹⁵
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reset 0
0
0
0
0
0
0000000000
Figure 17-18. PIT Count Register 3 (PITCNT3)
Read: Anytime
Write: Has no meaning or effect
Table 17-9. PITCNT0–3 Field Descriptions
Field
Description
15:0 PIT Count Bits 15-0 — These bits represent the current 16-bit modulus down-counter value. The read access
PCNT[15:0] for the count register must take place in one clock cycle as a 16-bit access.
MC9S12XHZ512 Data Sheet, Rev. 1.06
Freescale Semiconductor
635