ez80190 ZiLOG Semiconductor, ez80190 Datasheet - Page 45

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

Programmable Reload Timers
PS006613-0306
Clock
Programmable Reload Timers Overview
TMRx_CTL[3:2]
The eZ80190 device features six Programmable Reload Timers (PRT). Each PRT
contains a 16-bit downcounter and a 16-bit reload register. In addition, each PRT
features a 4-bit clock prescaler with four selectable taps for CLK ÷ 2, CLK ÷ 4,
CLK ÷ 8 and CLK ÷ 16. Each timer can be individually enabled to operate in either
SINGLE PASS or CONTINUOUS mode. The timer can be programmed to start,
stop, restart from the current value, or restart from the initial value, and generate
interrupts for the CPU.
Each of the 6 PRTs available on the eZ80190 device can be controlled individu-
ally. They do not share the same counters, reload registers, control registers, or
interrupt signals. A simplified block diagram of a programmable reload timer is
shown in
Adustable
Divider
Clock
Figure 3. Programmable Reload Timer Block Diagram
Figure
3.
{TMRx_RR_H,TMRx_RR_L}
{TMRx_DR_H,TMRx_DR_L}
Reload Registers
Data Registers
Downcounter
Data[7:0]
Data[7:0]
16-bit
PRELIMINARY
eZ80190 Product Specification
Control Register
Control Logic
TMRx_CTL
Data[7:0]
PRT
Programmable Reload Timers
eZ80
Interrupt to
®
CPU
31