M16C Datasheet, PDF(95/262 Page) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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M16C Datasheet, PDF (95/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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Timer B

Preliminary Specifications REV.B

Mitsubishi microcomputers

Specifications in this manual are tentative and subject to change.

M16C / 6N Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

(1) Timer mode

In this mode, the timer counts an internally generated count source. (See Table 10-1.) Figure 10-4 shows

the timer Bi mode register in timer mode.

Table 10-1. Timer specifications in timer mode

Item

Specification

Count source

f2, f8, f32, fC32

Count operation

â¢ Counts down

â¢ When the timer underflows, it reloads the reload register contents before

continuing counting

Divide ratio

1/(n+1) n : Set value

Count start condition

Count start flag is set (= 1)

Count stop condition

Count start flag is reset (= 0)

Interrupt request generation timing The timer underflows

TBiIN pin function

Programmable I/O port

Read from timer

Count value is read out by reading timer Bi register

Write to timer

â¢ When counting stopped

When a value is written to timer Bi register, it is written to both reload register and counter

â¢ When counting in progress

When a value is written to timer Bi register, it is written to only reload register

(Transferred to counter at next reload time)

Timer Bi mode register

b7 b6 b5 b4 b3 b2 b1 b0

00

Symbol

TBiMR(i=0 to 5)

Address

039B16 to 039D16

01DB16 to 01DD16

When reset

00XX00002

00XX00002

Bit symbol

TMOD0

TMOD1

MR0

MR1

Bit name

Function

Operation mode select bit

b1 b0

0 0 : Timer mode

Invalid in timer mode

Can be â0â or â1â

RW

MR2

0 (Fixed to â0â in timer mode ; i = 0, 3)

(Note 1)

Nothing is assiigned (i = 1, 2, 4, 5).

This bit can neither be set nor reset. When read, its content is indeterminate.

(Note 2)

MR3

Invalid in timer mode.

This bit can neither be set nor reset. When read in timer mode,

its content is indeterminate.

TCK0

TCK1

Count source select bit

b7 b6

0 0 : f2

0 1 : f8

1 0 : f32

1 1 : fC32

Note 1: Timer B0, timer B3.

Note 2: Timer B1, timer B2, timer B4, timer B5.

Figure 10-4. Timer Bi mode register in timer mode

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