EZ80L92MCU Datasheet, PDF (101/241 Pages) Zilog, Inc. – eZ80Acclaim Flash Microcontrollers

eZ80L92 MCU
Product Specification
86
Timer Input Source Select Register
The Timer Input Source Select register, detailed in Table 37, sets the input source for Pro-
grammable Reload Timer 0–3 (TMR0, TMR1, TMR2, TMR3). Event frequency must be
less than one-half of the system clock frequency. When configured for event inputs
through the port pins, the Timers decrement on the fifth system clock rising edge follow-
ing the rising edge of the port pin.
Table 37. Timer Input Source Select Register (TMR_ISS = 0092h)
Bit
Reset
CPU Access
Note: R/W = Read/Write.
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R/W
0
0
R/W
Bit
Position
[7:6]
TMR3_IN
[5:4]
TMR2_IN
[3:2]
TMR1_IN
Value
00
01
10
11
00
01
10
11
00
01
10
11
Description
The timer counts at the system clock divided by the
prescaler.
The timer event input is the Real-Time Clock source
(32KHz or 50/60Hz—refer to the Real-Time Clock section
on page 88 for details).
The timer event input is the GPIO Port B pin 1.
The timer event input is the GPIO Port B pin 1.
The timer counts at the system clock divided by the
prescaler.
The timer event input is the Real-Time Clock source
(32KHz or 50/60Hz—refer to the Real-Time Clock section
on page 88 for details).
The timer event input is the GPIO Port B pin 0.
The timer event input is the GPIO Port B pin 0.
The timer counts at the system clock divided by the
prescaler.
The timer event input is the Real-Time Clock source
(32KHz or 50/60Hz—refer to the Real-Time Clock section
on page 88 for details).
The timer event input is the GPIO Port B pin 1.
The timer event input is the GPIO Port B pin 1.
PS013012-1004
PRELIMINARY
Programmable Reload Timers