M16C6K9 Datasheet, PDF (93/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Timer B
(1) Timer mode
In this mode, the timer counts an internally generated count source. (See Table.FB-6.) Fig.FB-17 shows the
timer Bi mode register in timer mode.
Table.FB-6 Timer specifications in timer mode
Item
Specification
Count source
f1, f8, f32, fC32
Count operation
•Counts down
•When the timer underflows, it reloads the reload register contents and
then 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
•When counting stopped
When a value is written to timer Bi register, it is written to both reload register and counter
• 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
035B16 to 035D16
When reset
00XX00002
00XX00002
Bit symbol
TMOD0
TMOD1
MR0
MR1
Bit name
Operation mode selection
bits
Function
b1 b0
0 0 : Timer mode
Invalid in timer mode
Can be “0” or “1”
RW
MR2
MR3
TCK0
TCK1
0 (Set to “0” in timer mode ; i = 0, 3)
Nothing is assigned (i = 1, 2, 4, 5).
In an attempt to write to this bit, write “0”. The value, if read, turns out
to be indeterminate.
(Note 1)
(Note 2)
Invalid in timer mode.
In an attempt to write to this bit, write “0”. The value, if read in
timer mode, turns out to be indeterminate.
b7 b6
Count source selection bits _{0 0 : f1}
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.
Fig.FB-17 Timer Bi mode register in timer mode
Rev.1.00 Jun 06, 2003 page 93 of 290