M16C6K9 Datasheet, PDF (84/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Timer A
(1) Timer mode
In this mode, the timer counts an internally generated count source. (See Table.FB-1) Fig.FB-7 shows the
timer Ai mode register in timer mode.
Table.FB-1 Specifications of timer mode
Item
Count source
Count operation
Divide ratio
Count start condition
Count stop condition
Interrupt request generation timing
TAiIN pin function
TAiOUT pin function
Read from timer
Write to timer
Select function
Specification
f1, f8, f32, fC32
• Down count
• When the timer underflows, it reloads the reload register contents and then continuing counting
1/(n+1) n : Set value
Count start flag is set (= 1)
Count start flag is reset (= 0)
When the timer underflows
Programmable I/O port or gate input
Programmable I/O port or pulse output
Count value can be read out by reading timer Ai register
• When counting stopped
When a value is written to timer Ai register, it is written to both reload register and counter
• When counting in progress
When a value is written to timer Ai register, it is written to only reload register
(Transferred to counter at next reload time)
• Gate function
Counting can be started and stopped by the TAiIN pin’s input signal
• Pulse output function
Each time the timer underflows, the TAiOUT pin’s polarity is reversed
Timer Ai mode register
b7 b6 b5 b4 b3 b2 b1 b0
0
00
Symbol
TAiMR(i=0 to 4)
Address
When reset
039616 to 039A16 0016
Bit symbol
TMOD0
TMOD1
MR0
Bit name
Operation mode
selection bits
Pulse output function
selection bit
Function
b1 b0
0 0 : Timer mode
0 : Pulse is not output
(TAiOUT pin is a normal port pin)
1 : Pulse is output (Note 1)
(TAiOUT pin is a pulse output pin)
RW
MR1
MR2
MR3
TCK0
TCK1
Gate function selection bits
b4 b3
0 X (Note 2): Gate function not available
(TAiIN pin is a normal port pin)
1 0 : Timer counts only when TAiIN pin is
held “L” (Note 3)
1 1 : Timer counts only when TAiIN pin is
held “H” (Note 3)
0 (Must always be fixed to “0” in timer mode)
Count source selection bits
b7 b6
0 0 : f1
0 1 : f8
1 0 : f32
1 1 : fC32
Note 1: The settings of the corresponding port register and port direction register
are invalid.
Note 2: The bit can be “0” or “1”.
Note 3: Set the corresponding port direction register to “0”.
Fig.FB-7 Timer Ai mode register in timer mode
Rev.1.00 Jun 06, 2003 page 84 of 290