Usage Notes; Operation Of Tpc Output Pins; Note On Non-Overlapping Output - Hitachi H8/3008 Hardware Manual

10.4

Usage Notes

10.4.1

Operation of TPC Output Pins

TP to TP are multiplexed with 16-bit timer, address bus, and other pin functions. When 16-bit
0 15
timer, or address bus output is enabled, the corresponding pins cannot be used for TPC output. The
data transfer from NDR bits to DR bits takes place, however, regardless of the usage of the pin.
Pin functions should be changed only under conditions in which the output trigger event will not
occur.
10.4.2

Note on Non-Overlapping Output

During non-overlapping operation, the transfer of NDR bit values to DR bits takes place as
follows.
1. NDR bits are always transferred to DR bits at compare match A.
2. At compare match B, NDR bits are transferred only if their value is 0. Bits are not transferred
if their value is 1.
Figure 10.9 illustrates the non-overlapping TPC output operation.
TPC output pin
296
DDR NDER
Q
Q
Figure 10.9 Non-Overlapping TPC Output
Q
C
DR D
Compare match A
Compare match B
Q NDR D