M306V5ME-XXXSP Datasheet, PDF (70/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306V5ME-XXXSP
M306V5EESP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
2.10.1 Timer A
Figure 2.10.3 shows the block diagram of timer A. Figures 2.10.4 to 2.10.10 show the timer A-related
registers.
Except the pulse output function, timers A0 through A4 all have the same function. Use the timer Ai mode
register (i = 0 to 4) bits 0 and 1 to choose the desired mode.
Timer A has the four operation modes listed as follows:
• Timer mode: The timer counts an internal count source.
• Event counter mode: The timer counts a timer over flow.
• One-shot timer mode: The timer stops counting when the count reaches “000016”.
• Pulse width modulation (PWM) mode: The timer outputs pulses of a given width.
Clock source
selection
f1
f8
f32
• Timer
• One shot
• PWM
Data bus high-order bits
Data bus low-order bits
Low-order
8 bits
Reload register (16)
High-order
8 bits
Clock selection
TB2 overflow
TAj overflow
External
trigger
(j = i – 1. Note, however, that j = 4 when i = 0)
TAk overflow
(k = i + 1. Note, however, that k = 0 when i = 4)
Count start flag
(Address 038016)
Down count
Up/down flag
(Address 038416)
TAiOUT
(i = 2, 3)
Pulse output
Toggle flip-flop
Counter (16)
Up count/down count
Always down count except
in event counter mode
TAi
Timer A0
Timer A1
Timer A2
Timer A3
Timer A4
Addresses
038716 038616
038916 038816
038B16 038A16
038D16 038C16
038F16 038E16
TAj
Timer A4
Timer A0
Timer A1
Timer A2
Timer A3
TAk
Timer A1
Timer A2
Timer A3
Timer A4
Timer A0
Figure 2.10.3 Block diagram of timer A
Timer Ai mode register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
TAiMR(i=0 to 4)
Address
When reset
039616 to 039A16 0016
Bit symbol
TMOD0
TMOD1
MR0
MR1
MR2
MR3
TCK0
TCK1
Bit name
Operation mode select bit
Function
b1 b0
0 0 : Timer mode
0 1 : Event counter mode
1 0 : One-shot timer mode
1 1 : Pulse width modulation
(PWM) mode
Function varies with each operation mode
Count source select bit
(Function varies with each operation mode)
RW
Figure 2.10.4 Timer Ai mode register (i = 0 to 4)
70
Rev. 1.0