MB90F654A FUJITSU [Fujitsu Component Limited.], MB90F654A Datasheet - Page 47

• Manufacturer Part Number: MB90F654A
• Description: 16-bit Proprietary Microcontroller
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

7. 8/16-bit Up/Down Counter/Timer
(1) Main Functions
8/16-bit up/down counter/timer is an up/down counter/timer and consists of six event input pins, two 8-bit up/
down counters, two 8-bit reload/compare registers, and their control circuits.
• The 8-bit count register can count in the range 0 to 256 (or 0 to 65535 in 1
• The count clock selection can select between four different count modes.
• Two different internal count clocks are available in timer mode.
• In up/down count mode, you can select which edge to detect on the external pin input signal.
• Phase difference count mode is suitable for motor encoder counting. By inputting the A, B, and Z phase outputs
• Two different functions can be selected for the ZIN pin.
• Compare and reload functions are available and can be used either independently or together. A variable-
• Whether or not to generate an interrupt when a compare, reload (underflow), or overflow occurs can be set
• The previous count direction can be determined from the count direction flag.
• An interrupt can be generated when the count direction changes.
Count modes
Count clock (at 12 MHz operation)
Detected edge
from the encoder, a high-precision rotational angle, speed, or similar count can be implemented simply.
ZIN pin
width up/down count can be performed by activating both functions.
Compare/reload function
independently.
Timer mode
Up/down counter mode
Phase difference count mode ( 2)
Phase difference count mode ( 8)
Detect falling edges
Detect rising edges
Detect both rising and falling edges
Edge detection disabled
Counter clear function
Gate function
166 ns (6 MHz: Divide by 2)
0.67 s (1.5 MHz: Divide by 8)
Compare function (Output an interrupt when a compare
occurs.)
Compare function (Output an interrupt and clear the
counter when a compare occurs.)
Reload function (Output an interrupt and reload when
an underflow occurs.)
Compare/reload function
(Output an interrupt and clear the counter when a com-
pare occurs. Output an interrupt and reload when an
underflow occurs.)
Compare/reload disabled
MB90650A Series
16-bit operation mode).
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