m30262f8gp Renesas Electronics Corporation., m30262f8gp Datasheet - Page 87

• Manufacturer Part Number: m30262f8gp
• Description: Renesas 16-bit Cmos Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

Timer A
Table 1.12.1. Specifications of timer mode
Figure 1.12.7. Timer Ai mode register in timer mode
(1) Timer mode
Count source
Count operation
Divide ratio
Count start condition
Count stop condition
Interrupt request generation timing When the timer underflows
TAi
TAi
Read from timer
Write to timer
Select function
In this mode, the timer counts an internally generated count source. (See Table 1.12.1.) Figure 1.12.7
shows the timer Ai mode register in timer mode.
IN
OUT
pin function
Timer Ai mode register
b7
pin function
Item
b6
Preliminary Specifications Rev. 0.9
b5
0
Specifications in this manual are tentative and subject to change.
b4
b3
b2
0 0
b1
b0
f
• Down count
• When the timer underflows, it reloads the reload register contents before continuing counting
1/(n+1)
Count start flag is set (= 1)
Count start flag is reset (= 0)
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 counting in progress
(Transferred to counter at next reload time)
• Gate function
• Pulse output function
1
When a value is written to timer Ai register, it is written to both reload register and counter
When a value is written to timer Ai register, it is written to only reload register
, f
Counting can be started and stopped by the TAi
Each time the timer underflows, the TAi
Note 1: The settings of the corresponding port register and port direction register
Note 2: The bit can be 0 or 1 .
Note 3: Set the corresponding port direction register to 0 .
Bit symbol
2
TMOD0
TMOD1
, f
TCK0
TCK1
MR0
MR1
MR2
MR3
Symbol
TAiMR(i=0 to 4)
8
, f
are invalid.
32,
Renesas Technology Corp.
f
C32
Operation mode
select bit
Pulse output function
select bit
Gate function select bit
0 (Must always be 0 in timer mode)
Count source select bit
n : Set value
0396
Bit name
Address
16
to 039A
Specification
16
When reset
0 0 : Timer mode
b7 b6
0 : Pulse is not output
1 : Pulse is output (Note 1)
b4 b3
0 X
1 0 : Timer counts only when TA
1 1 : Timer counts only when TA
0 0 : f
0 1 : f
1 0 : f
1 1 : f
b1 b0
00
(TA
(TA
(Note 2)
held L (Note 3)
held H (Note 3)
16
1
8
32
C32
iOUT
or f
iOUT
OUT
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
2
: Gate function not available
pin is a normal port pin)
pin is a pulse output pin)
(TAi
pin’s polarity is reversed
Function
IN
pin is a normal port pin)
IN
pin’s input signal
iIN
iIN
pin is
pin is
M16C/26 Group
R
W
81