MC68HC912B32VFU8 Freescale Semiconductor, MC68HC912B32VFU8 Datasheet - Page 183

• Manufacturer Part Number: MC68HC912B32VFU8
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC912B32VFU8

• Cpu Family: HC12
• Device Core Size: 16b
• Frequency (max): 8MHz
• Interface Type: SCI/SPI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 1KB
• # I/os (max): 63
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 105C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 80
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

PACMX — 8-Bit Pulse Accumulators Maximum Count Bit
BUFEN — IC Buffer Enable Bit
LATQ — Input Control Latch or Queue Mode Enable Bit
13.4.20 Timer Test Register
Read: Anytime
Write: Only in special mode (SMOD = 1)
Freescale Semiconductor
By setting TFMOD in queue mode, when NOVW bit is set and the corresponding capture and holding
registers are emptied, an input capture event will first update the related input capture register with the
main timer contents. At the next event, the TCn data is transferred to the TCnH register, the TCn is
updated, and the CnF interrupt flag is set. See
interrupt flag is set by a valid external event on PTn.
The BUFEN control bit should be set to enable the IC and pulse accumulators’ holding registers.
Otherwise, LATQ latching modes are disabled.
Writing one into ICLAT bit in MCCTL ($A6), when LATQ and BUFEN are set will produce latching of
input capture and pulse accumulators registers into their holding registers.
0 = The timer flags C3F–C0F in TFLG1 ($8E) are set when a valid input capture transition on the
1 = If in queue mode (BUFEN = 1 and LATQ = 0), the timer flags C3F–C0F in TFLG1 ($8E) are set
0 = Normal operation. When the 8-bit pulse accumulator has reached the value $FF, with the next
1 = When the 8-bit pulse accumulator has reached the value $FF, it will not be incremented further.
0 = Input capture and pulse accumulator holding registers are disabled.
1 = Input capture and pulse accumulator holding registers are enabled. The latching mode is
0 = Queue mode of input capture is enabled. The main timer value is memorized in the IC register
1 = Latch mode is enabled. Latching function occurs when modulus down-counter reaches 0 or a 0
corresponding port pin occurs.
only when a latch on the corresponding holding register occurs. If the queue mode is not
engaged, the timer flags C3F–C0F are set the same way as for TFMOD = 0.
active edge, it will be incremented to $00.
The value $FF indicates a count of 255 or more.
defined by LATQ control bit. Writing a 1 into ICLAT bit in MCCTL ($A6) when LATQ is set, will
produce latching of input capture and pulse accumulator registers into their holding registers.
by a valid input pin transition. With a new occurrence of a capture, the value of the IC register
will be transferred to its holding register and the IC register memorizes the new timer value.
is written into the count register MCCNT (see
event the contents of IC registers and 8-bit pulse accumulators are transferred to their holding
registers. The 8-bit pulse accumulators are cleared.
Address: $00AD
Reset:
Read:
Write:
1. Available only on MC68HC912B32 devices.
Bit 7
0
0
Figure 13-41. Timer Test Register (TIMTST)
= Unimplemented
6
0
0
M68HC12B Family Data Sheet, Rev. 9.1
5
0
0
Figure
4
0
0
13.3.1.2 Buffered IC
13-19. In all other input capture cases, the
3
0
0
2
0
0
TCBYP
Channels). With a latching
1
0
PCBYP
Bit 0
0
(1)
Timer Registers
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