Panasonic MN101C77C, F77G user manual Setup Example, Source of the binary counter

Chapter 7 16-bit Timer

7-8-2 Setup Example

„Synchronous Output Setup Example (Timer 7)

Setup example that latched data of port 6 is output constantly (100 µs) by using timer 7 from the synchro- nous output pin is shown below. The clock source of timer 7 is selected fs/4 (at fosc=8 MHz).

An example setup procedure, with a description of each step is shown below.

Setup Procedure				Description
(1) Stop the counter.			(1) Set the TM7EN flag of the timer 7 mode
TM7MD1 (x'3F78')			register 1 (TM7MD1) to "0" to stop timer 7
bp4	: TM7EN	= 0	counting.
(2) Select the synchronous output			(2) Set the SYOEVS1-0 flag of the pin control
event.			register (FLOAT) to "01" to set the
FLOAT (x'3F2E')			synchronous output event to the timer 7
bp1-0	: SYOEVS1-0 = 01		interrupt.
(3) Set the synchronous output pin.			(3) Set the port 6 synchronous output control
P6SYO (x'3F1E')		= x'FF'	register (P6SYO) to x'FF' to set the
P6DIR(x'3F36')		= x'FF'	synchronous output pin.
			(P67 to P60 : Synchronous output pin)
			Set the port 6 direction control register
			(P6DIR) to x'FF' to set port 6 to output pin.
			If it needs, pull-up resistor should be added.
			[	Chapter 4 I/O Ports ]
(4) Select the condition of timer clear.			(4) Set the TM7BCR flag of the TM7MD2 register
TM7MD2 (x'3F79')			to "1" to select the compare match as a clear
bp5	: TM7BCR	= 1	source of the binary counter.
(5) Select the count clock source.			(5) Select fs as a clock source by the TM7CK1-0
TM7MD1 (x'3F78')			flag of the TM7MD 1 register.
bp1-0	: TM7CK1-0 = 01		Also, select a 1/4 dividing as a clock source by
bp3-2	: TM7PS1-0 = 10		the TM7PS1-0 flag.
(6) Set the synchronous output event			(6) Set the synchronous output event generation
generation cycle.			cycle to the timer 7 preset register 1
TM7PR1 (x'3F75',x'3F74')=x'0063'			(TM7PR1). To be 10 kHz by dividing 1 MHz,
			set as follows ;
				100 - 1 = 99 (x'0063')
			At that time, the same value is loaded to the
			timer 7 compare register 1 (TM7OC1), and
			TM7BC is initialized to x'0000'.

VII - 32 16-bit Timer Synchronous Output