Fujitsu MB90335 Series Hardware Manual page 312

MB90335 Series
■ Block Diagram of PWC Timer
Figure 13.1-1 shows the PWC timer block diagram.
PWCR read
Data transmit
Overflow
Control circuit
Measurement
start edge
Measurement
end edge
Measurement end
interrupt request
Overflow interrupt
request
15
CM44-10137-6E
Figure 13.1-1 Block Diagram of PWC Timer
Error
detection
PWCR
16
Reload
16-bit Up count timer
Start edge End edge
Division ON/OFF
selection selection
Edge
detection
PIS0/PIS1
ERR
CKS0/CKS1
PWCSR
2
FUJITSU MICROELECTRONICS LIMITED
ERR
16
Clock
Timer
clear
CKS1/CKS0
Count enabled
8-bit
divider
Ratio selection
DIVR
CHAPTER 13 PWC TIMER
13.1 Overview of PWC Timer
Internal clock (Machine clock/4)
2
2
Clock divider
3
2
Divider clear
Input
waveform
PWC
comparator
291