hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 338

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 9 Timers
No.
3
4
Note: * The switchover is seen as a falling edge, and TCG is incremented.
Notes on Port Mode Register Modification
The following points should be noted when a port mode register is modified to switch the input
capture function or the input capture input noise canceler function.
• Switching input capture input pin function
Rev. 7.00 Mar 10, 2005 page 296 of 652
REJ09B0042-0700
Note that when the pin function is switched by modifying TMIG in port mode register 1
(PMR1), which performs input capture input pin control, an edge will be regarded as having
been input at the pin even though no valid edge has actually been input. Input capture input
signal input edges, and the conditions for their occurrence, are summarized in table 9.14.
Clock Levels Before and After
Modifying Bits CKS1 and CKS0
Goes from high level to low level
Goes from high level to high level
TCG Operation
TCG
TCG
Clock before
switching
Clock after
switching
Count
clock
Clock before
switching
Clock after
switching
Count
clock
N
N
Write to CKS1 and CKS0
N+1
N+1
*
Write to CKS1 and CKS0
N+2
N+2