M16CSLASH29 datasheet(147/499 Pages) RENESAS

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12. Timer B

page 123

12.2.4 A/D Trigger Mode

A/D trigger mode is used together with simultaneous sample sweep mode or delayed trigger mode 0 of

A/D conversion to start A/D conversion. It is used in timer B0 and timer B1 only. In this mode, the timer

starts counting by one trigger until the count value becomes 000016. Figure 12.23 shows the TBiMR

Item

Specification

Count Source

f1, f2, f8, f32, and fC32

Count Operation

• Decrement

• When the timer underflows, reload register contents are reloaded before

stopping counting

• When a trigger is generated during the count operation, the count is not

affected

Divide Ratio

1/(n+1)

n: Setting value of TBi register (i=0,1)

000016-FFFF16

Count Start Condition

When the TBiS (i=0,1) bit in the TABSR register is 1(count started),

TBiEN(i=0,1) in TB2SC register is 1 (A/D trigger mode) and the following

trigger is generated.(Selection based on bits TB2SEL in the TB2SC)

• Timer B2 interrupt

• Underflow of Timer B2 interrupt generation frequency counter setting

Count Stop Condition

• After the count value is 000016 and reload register contents are reloaded

• Set the TBiS bit to 0 (count stopped)

Interrupt Request

Timer underflows (1)

Generation Timing

TBiIN Pin Function

I/O port

Read From Timer

Count value can be read by reading TBi register

Write To Timer (2)

• When writing in the TBi register during count stopped.

Value is written to both reload register and counter

• When writing in the TBi register during count.

Value is written to only reload register (Transfered to counter when reloaded next)

NOTES:

1: A/D conversion is started by the timer underflow. For details refer to 15. A/D Converter.

2: When using in delayed trigger mode 0, set the larger value than the value of the timer B0 register

to the timer B1 register.

Table 12.9 Specifications in A/D Trigger Mode

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