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S912XEP100J5MAG Datasheet, PDF (553/1324 Pages) Freescale Semiconductor, Inc – Features of the MC9S12XE-Family are listed here. Please see Table D-2.for memory options and Table D-2. for the peripheral features that are available on the different family members. | |||
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Chapter 14 Enhanced Capture Timer (ECT16B8CV3)
All bits reset to zero.
The two 8-bit pulse accumulators PAC1 and PAC0 are cascaded to form the PACB 16-bit pulse
accumulator. When PACB in enabled, (PBEN = 1 in PBCTL) the PACN1 and PACN0 registers contents
are respectively the high and low byte of the PACB.
When PACN1 overï¬ows from 0x00FF to 0x0000, the interrupt ï¬ag PBOVF in PBFLG is set.
Full count register access will take place in one clock cycle.
NOTE
A separate read/write for high byte and low byte will give a different result
than accessing them as a word.
When clocking pulse and write to the registers occurs simultaneously, write
takes priority and the register is not incremented.
14.3.2.19 16-Bit Modulus Down-Counter Control Register (MCCTL)
Module Base + 0x0026
R
W
Reset
7
MCZI
0
6
MODMC
0
5
RDMCL
0
4
0
ICLAT
0
3
0
FLMC
0
2
MCEN
0
1
MCPR1
0
Figure 14-42. 16-Bit Modulus Down-Counter Control Register (MCCTL)
Read: Anytime
Write: Anytime
All bits reset to zero.
0
MCPR0
0
Table 14-23. MCCTL Field Descriptions
Field
Description
7
MCZI
6
MODMC
5
RDMCL
Modulus Counter Underï¬ow Interrupt Enable
0 Modulus counter interrupt is disabled.
1 Modulus counter interrupt is enabled.
Modulus Mode Enable
0 The modulus counter counts down from the value written to it and will stop at 0x0000.
1 Modulus mode is enabled. When the modulus counter reaches 0x0000, the counter is loaded with the latest
value written to the modulus count register.
Note: For proper operation, the MCEN bit should be cleared before modifying the MODMC bit in order to reset
the modulus counter to 0xFFFF.
Read Modulus Down-Counter Load
0 Reads of the modulus count register (MCCNT) will return the present value of the count register.
1 Reads of the modulus count register (MCCNT) will return the contents of the load register.
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor
553
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