IA88C00-PDW48C-R datasheet(37/80 Pages) INNOVASIC

37 / 80 page

IA88C00

Data Sheet

Microcontroller

As of Production Version -01

ENG 21 0 050519-00

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Figure 34. Port 0 Mode Control Register (P0M), R240 Bank 0

Bit

Initial Value

Read/Write

R/W

The Port 0 Mode register programs each bit of Port 0 as an address output (part of an external memory

interface) or as an I/O bit. When a bit of this register is 1, the corresponding bit of Port 0 is defined as an

address output. When 0, the corresponding bit of Port 0 is defined as an I/O bit. D0-D7 - P00-P07 Mode,

0 = I/O, 1 = Address.

Figure 35. Port Mode Register (pm), R241 Bank 0

Bit

Initial Value

Read/Write

The Port Mode register provides some additional mode control for Ports 0 and 1.

D0 - Port 0 Direction - If this bit is a 1, all bits of Port 0 configured as I/O will be inputs. If this bit is a 0,

the I/O lines will be outputs.

D1 - Open-Drain Port 0 - If this bit is a 1, all bits of Port 0 configured as outputs will be open-drain

outputs. If 0, they will be push-pull outputs. This bit has no effect on those bits not configured as outputs.

D2 - Open-Drain Port 1 - If Port 1 is configured as an output port and this bit is a 1, all of the port will

be open-drain outputs. If this bit is a 0, they will be push-pull outputs. This bit has no effect if Port 1 is

not configured as an output port or A/D 0-7.

D3 - Enable /DM - If this bit is a 1, Port 35 is configured as Data Memory output line /DM.

D4-D5 - This field selects the configuration of Port 1 as an output port, input port, or address/data port as

part of the external memory interface.

Figure 36. Handshake 0 Control (H0C), R244 Bank 0

Bit

Initial Value

Read/Write

W/O

This register controls Handshake Channel 0.

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