7220 Datasheet, PDF (61/303 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

FUNCTIONAL DESCRIPTION
2.6 Timers
2.6 Timers
M37221M6-XXXSP/FP has four 8-bit timers with reload latch. Figure 2.6.1 shows the timer block diagram.
1/4096
XIN
1/2
P24/TIM2
(Note 3)
HSYNC
P23/TIM3
(Note 3)
Selection gate :
Connected to black
side at reset
T12M : Timer 12 mode register
T34M : Timer 34 mode register
Data bus
8
Timer 1 latch (8)
8
1/8
T12M0
T12M2
T12M4
Timer 1 (8)
8
8
T12M1
T12M3
T34M5
T34M0
T34M2
T34M1
T34M4
T34M3
Timer 2 latch (8)
8
Timer 2 (8)
8
8
FF16
Timer 3 latch (8)
8
Timer 3 (8)
8
8
0716
Timer 4 latch (8)
8
Timer 4 (8)
8
Timer 1
interrupt request
Timer 2
interrupt request
Reset
STP
instruction
Timer 3
interrupt request
Timer 4
interrupt request
Notes 1: HIGH pulse width of external clock inputs TIM2 and TIM3 needs 4 machine cycles or more.
2: When the external clock source is selected, timers 2 and 3 are counted at a rising edge of input signal.
3: In the stop mode or the wait mode, external clock inputs TIM2 and TIM3 cannot be used.
Fig. 2.6.1 Timer 1, timer 2, timer 3, and timer 4 block diagram
2-34
7220 Group User’s Manual