DEMO9S12XEP100 Freescale Semiconductor, DEMO9S12XEP100 Datasheet - Page 555

• Manufacturer Part Number: DEMO9S12XEP100
• Description: BOARD DEMO FOR MC9S12XEP100
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S12XEP100

• Contents: Board, Cables, CD
• Processor To Be Evaluated: MC9S12XEP100
• Data Bus Width: 16 bit
• Interface Type: RS-232
• Silicon Manufacturer: Freescale
• Core Architecture: S12
• Core Sub-architecture: S12
• Silicon Core Number: MC9S12
• Silicon Family Name: S12XE
• Rohs Compliant: Yes
• For Use With/related Products: MC9S12XEP100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 overflows from 0x00FF to 0x0000, the interrupt flag PBOVF in PBFLG is set.
Full count register access will take place in one clock cycle.
14.3.2.19 16-Bit Modulus Down-Counter Control Register (MCCTL)
Read: Anytime
Write: Anytime
All bits reset to zero.
Freescale Semiconductor
Module Base + 0x0026
Because of an order from the United States International Trade Commission, BGA-packaged product lines and partnumbers
MODMC
RDMCL
Reset
indicated here currently are not available from Freescale for import or sale in the United States prior to September 2010
MCZI
Field
7
6
5
W
R
MCZI
Modulus Counter Underflow 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
Note: For proper operation, the MCEN bit should be cleared before modifying the MODMC bit in order to reset
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.
0
7
value written to the modulus count register.
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.
Figure 14-42. 16-Bit Modulus Down-Counter Control Register (MCCTL)
the modulus counter to 0xFFFF.
MODMC
0
6
MC9S12XE-Family Reference Manual Rev. 1.23
Table 14-23. MCCTL Field Descriptions
RDMCL
5
0
ICLAT
NOTE
0
0
4
Description
FLMC
0
0
3
Chapter 14 Enhanced Capture Timer (ECT16B8CV3)
MCEN
2
0
MCPR1
0
1
MCPR0
0
0
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