MC68340AG16E Freescale Semiconductor, MC68340AG16E Datasheet - Page 354

• Manufacturer Part Number: MC68340AG16E
• Description: IC MPU 32BIT 16MHZ 144-LQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68340AG16E

• Processor Type: M683xx 32-Bit
• Speed: 16MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Controller Family/series: 68K
• Core Size: 32 Bit
• No. Of I/o's: 16
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Embedded Interface Type: UART
• Digital Ic Case Style: LQFP
• Rohs Compliant: Yes
• Processor Series: M683xx
• Core: CPU32
• Maximum Clock Frequency: 16 MHz
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Details

COUNTER
successive timeout causes the counter to be loaded alternately with the values from
PREL1 and PREL2.
TOUTx behaves as a variable duty-cycle square wave when the CR OC bits are
programmed for toggle mode. The second timeout occurs after N2 + 1 periods (allowing
for the zero cycle), resulting in a change of state on TOUTx. The third timeout occurs after
N1 + 1 periods, resulting in a change of state on TOUTx, and so on (see Figure 8-6). The
OUT bit in the SR reflects the level of TOUTx.
COUNTER
MODEx Bits in Control Register = 010
Preload 1 Register = N1 = 4
Preload 2 Register = N2 = 2
OCx Bits in Control Register = 01
If TGATE
disabled. Additionally, the TG bit of the SR is set, indicating that TGATE was negated.
The ON bit of the SR is cleared, indicating that the timer is disabled. If TGATE is
reasserted, the timer is re-enabled and begins counting from the value attained when
TGATE was negated. The ON bit is set again.
If TGATE is not enabled (TGE = 0), TGATE has no effect on the operation of the timer.
In this case, the counter would begin counting on the falling edge of the counter clock
immediately after the SWR and CPE bits in the CR are set. The SR TG bit cannot be set.
At all times, the TGL bit in the SR reflects the level of TGATE .
The duty cycle of the waveform generated on TOUTx can be dynamically changed by
writing new values into PREL1 and/or PREL2. If PREL1 or PREL2 is being accessed
simultaneously by the counter logic and a CPU32 write, the old preload value may actually
get loaded into the counter at timeout. If at timeout, the counting logic was accessing
PREL2 and the CPU32 was writing to PREL1 (or visa versa), there would be no
unexpected results.
8.3.4 Variable-Width Single-Shot Pulse Generator
This mode is used to produce a one-time pulse that has a delay controlled by the value
stored in PREL1 and a duration controlled by the value stored in PREL2. With TOUTx
programmed to change state, this sequence creates a single pulse of variable width. This
mode can be selected by programming the CR MODE bits to 011.
8-10
CLOCK
TOUT
0
ENABLE
0
Figure 8-6. Variable Duty-Cycle Square-Wave Generator Mode
is negated when it is enabled (TGE = 1), the prescaler and counter are
N1: N1 + 1
4
3
Freescale Semiconductor, Inc.
2
For More Information On This Product,
1
TIMEOUT
MC68340 USER’S MANUAL
Go to: www.freescale.com
0
2
N2 + 1
1
TIMEOUT
0
4
3
N1 + 1
2
1
TIMEOUT
0
2
N2 + 1
MOTOROLA
1
TIMEOUT
0