uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
uPD789871 Subseries 8-Bit Single-Chip Microcontrollers PUM
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62<br />
CHAPTER 4 PORT FUNCTIONS<br />
4.2.5 Port 9<br />
This is an 8-bit P-ch open-drain output port. Mask ROM versions include an on-chip pull-down resistor (connected<br />
to VLOAD).<br />
Internal bus<br />
Internal bus<br />
RESET input sets port 9 to output mode.<br />
Figures 4-9 and 4-10 show block diagrams of port 9.<br />
WRPORT<br />
RDPORT<br />
WRPORT<br />
RDPORT<br />
Figure 4-9. Block Diagram of P90 to P97 (µPD789870, 789871)<br />
Output latch<br />
(P90 to P97)<br />
Alternate<br />
function<br />
Output latch<br />
(P90 to P97)<br />
Alternate<br />
function<br />
Figure 4-10. Block Diagram of P90 to P97 (µPD78F9872)<br />
Preliminary User’s Manual U14938EJ1V0UM<br />
VDD1<br />
VDD1<br />
P-ch<br />
P-ch<br />
P90/FIP16 to<br />
P97/FIP9<br />
VLOAD<br />
P90/FIP16 to<br />
P97/FIP9
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