HD643303x Hitachi, HD643303x Datasheet - Page 258

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

Examples of Buffering: Figure 8-49 shows an example in which GRA is set to function as an
output compare register buffered by BRA, TCNT is set to operate as a periodic counter cleared by
GRB compare match, and TIOCA and TIOCB are set to toggle at compare match A and B.
Because of the buffer setting, when TIOCA toggles at compare match A, the BRA value is
simultaneously transferred to GRA. This operation is repeated each time compare match A occurs.
Figure 8-50 shows the transfer timing.
GRB
H'0250
H'0200
H'0100
H'0000
BRA
GRA
TIOCB
TIOCA
Figure 8-49 Register Buffering (Example 1: Buffering of Output Compare Register)
TCNT value
H'0200
H'0250
H'0200
H'0100
Counter cleared by compare match B
243
Compare match A
H'0100
H'0200
H'0200
Time
Toggle
output
Toggle
output