M32C83T datasheet(178/527 Pages) RENESAS

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Page 155

14. Timer (Timer B)

)

(

14.2.1 Timer Mode

In timer mode, the timer counts an internally generated count source (see Table 14.9). Figure 14.20

shows the TBiMR register (i=0 to 5) in timer mode.

Table 14.9 Specifications in Timer Mode

Item

Specification

Count Source

f1, f8, f2n(1), fC32

Counting Operation

The timer decrements a counter value

• When the timer counter underflows, content of the reload register is reloaded into the

count register and counting resumes

Divide Ratio

1/(n+1)

n: setting value of the TBi register (i=0 to 5)

000016 to FFFF16

Counter Start Condition

The TBiS bits in the TABSR or TBSR registers are set to "1" (starts counting)

Counter Stop Condition

The TBiS bit is set to "0" (stops counting)

Interrupt Request Generation Timing The timer counter underflows

TBiIN Pin Function

Programmable I/O port

Read from Timer

The TBi register indicates counter value

Write to Timer

• When the timer counter stops,

the value written to the TBi register is also written to both reload register and counter

• While counting,

the value written to the TBi register is written to the reload register

(It is transferred to the counter at the next reload timing)

NOTES:

1. The CNT3 to CNT0 bits in the TCSPR register select no division (n=0) or divide-by-2n (n=1 to 15).

Figure 14.20 TB0MR to TB5MR Registers

Timer Bi Mode Register (i=0 to 5) (Timer Mode)

Symbol

Address

After reset

TB0MR to TB5MR 035B16, 035C16, 035D16, 031B16, 031C16, 031D16 00XX 00002

TMOD0

TMOD1

MR0

Operation Mode

Select Bit

MR1

MR3

MR2

TCK0

TCK1

Count Source

Select Bit

TB0MR, TB3MR registers:

Set to "0" in timer mode

Disabled in timer mode.

Can be set to "0" or "1".

0 0 : f1

0 1 : f8

1 0 : f2n(1)

1 1 : fC32

0 0 : Timer mode

b1b0

Bit Name

Function

Bit

Symbol

b7 b6

NOTES:

1. The CNT3 to CNT0 bits in the TCSPR register select no division (n=0) or divide-by-2n (n=1 to 15).

TB1MR, TB2MR TB4MR, TB5MR registers:

Nothing is assigned. When write, set to "0".

When read, its content is indeterminate.

00 0

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