TMP47C990E TOSHIBA [Toshiba Semiconductor], TMP47C990E Datasheet - Page 24

• Manufacturer Part Number: TMP47C990E
• Description: CMOS 4-bit Microcontroller
• Manufacturer: TOSHIBA [Toshiba Semiconductor]

TMP47C101/201
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3.3 Timer/Counters (TC1,TC2)
The 47C101/201 contain two 12-bit timer/counters (TC1,
TC2). RAM addresses are assigned to the count register in unit
of 4 bits, permitting the initial value setting and counter reading
3.3.1 Functions of Timer/Counters
The timer/counters provide the following functions:
Event counter
Programmable timer
Pulse width measurement
Figure 3-16. Count Registers of the Timer/Counters (TC1, TC2)
Figure 3-7. Timer/Counter Control Command Registers
through the RAM manipulation instruction. When the timer/
counter is not used, the mode selection may be set to
“stopped” to use the RAM at the address corresponding to the
timer/counter for storing the ordinary user-processed data.
3.3.2 Control of Timer/Counters
The timer/counters are controlled by the command registers.
The command register is accessed as port address OP1C for
TC1 and port address OP1D for TC2. These registers are ini-
tialized to “0” during reset.
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