ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 49

• Manufacturer Part Number: ez80190
• Description: Ez80190 Microprocessor
• Manufacturer: ZiLOG Semiconductor

PS006613-0306
Bit
Reset
CPU Access
Note: R = Read Only; R/W = Read/Write.
Bit
Position
7
PRT_IRQ
6
IRQ_EN
5
4
PRT_MODE
[3:2]
CLK_DIV
The Timer Control register can be read or written to. The timer reload registers are
Write Only and are located at the same I/O address as the timer data registers,
which are Read Only.
Timer Control Registers
The Timer Control registers, detailed in
the timer, including enabling the timer, selecting the clock divider, enabling the
interrupt, selecting between CONTINUOUS and SINGLE PASS modes, and
enabling the automatic reload feature.
(TMR0_CTL = 0080h, TMR1_CTL = 0083h, TMR2_CTL = 0086h,
TMR3_CTL = 0089h, TMR4_CTL = 008Ch, TMR5_CTL = 008Fh)
Value
0
1
0
1
0
0
1
00
01
10
11
Description
The timer has not reached its end-of-count value. This bit is
reset to 0 every time the TMRx_CTL register is read.
The timer has reached its end-of-count value. If IRQ_EN is set
to 1, an interrupt signal is sent to the CPU. This bit remains 1
until the TMRx_CTL register is read.
Timer interrupt requests are disabled.
Timer interrupt requests are enabled.
Reserved
The timer operates in SINGLE PASS mode. PRT_EN (bit 0) is
reset to 0, and counting stops when the end-of-count value is
reached.
The timer operates in CONTINUOUS mode. The timer reload
value is written to the counter when the end-of-count value is
reached.
Clock ÷ 2 is the timer input source.
Clock ÷ 4 is the timer input source.
Clock ÷ 8 is the timer input source.
Clock ÷ 16 is the timer input source.
R
7
0
Table 5. Timer Control Register
R/W
6
0
PRELIMINARY
R/W
5
0
R/W
Table
4
0
5, are used to control operation of
R/W
3
0
eZ80190 Product Specification
R/W
2
0
Programmable Reload Timers
R/W
1
0
R/W
0
0
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