Z8S180 Zilog., Z8S180 Datasheet - Page 171

• Manufacturer Part Number: Z8S180
• Description: ENHANCED Z180 MICROPROCESSOR
• Manufacturer: Zilog.

156
UM005001-ZMP0400
Z 8018x Fam il y
M PU Us e r M anual
Programmable Reload Timer (PRT)
Figure 62.
The Z8X180 contains a two channel 16-bit Programmable Reload Timer.
Each PRT channel contains a 16-bit down counter and a 16-bit reload
register. The down counter is directly read and written and a down counter
overflow interrupt can be programmably enabled or disabled. Also, PRT
channel 1 features a TOUT output pin (multiplexed with A18) which can be
set High, Low, or toggled. Thus, PRT1 can perform programmable output
waveform generation.
PRT Block Diagram
The PRT block diagram is depicted in Figure 63. The two channels
feature separate timer data and reload registers and a common status/
CKS
RXS
RE
EF
CSI/O Receive Timing–External Clock
11.5
Sampling
16.5
LSB
11.5
16.5
11.5
16.5
Read or write of CSI/O
11.5
Transmit/Receive
16.5
Data Register
MSB