MC68HC812A4 Datasheet, PDF (37/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

General Description
Signal Descriptions
Table 1-4. Port Pullup, Pulldown, and Reduced Drive Summary
Enable Bit
Reduced Drive Control Bit
Port
Name
Resistive
Input Loads
Register
(Address)
Bit Name
Reset
State
Register
(Address)
Bit Reset
Name State
Port A
Pullup
PUCR ($000C) PUPA Enabled RDRIV ($000D) RDPAB Full drive
Port B
Pullup
PUCR ($000C) PUPB Enabled RDRIV ($000D) RDPAB Full drive
Port C
Pullup
PUCR ($000C) PUPC Enabled RDRIV ($000D) RDPC Full drive
Port D
Pullup
PUCR ($000C) PUPD Enabled RDRIV ($000D) RDPD Full drive
Port E:
PE7, PE3,
PE2, PE0
Pullup
PUCR ($000C) PUPE Enabled RDRIV ($000D) RDPE Full drive
Port E:
PE1
Pullup
Always enabled
RDRIV ($000D) RDPE Full drive
Port E:
PE4
None
—
RDRIV ($000D) RDPE Full drive
Port E:
PE6 and PE5
Pulldown
Enabled during reset
—
—
—
Port F
Pullup
PUCR ($000C) PUPF Enabled RDRIV ($000D) RDPF Full drive
Port G
Pullup
PUCR ($000C) PUPG Enabled RDRIV ($000D) RDPG Full drive
Port H
Pullup
PUCR ($000C) PUPH Enabled RDRIV ($000D) RDPH Full drive
Port J
Pullup/down^{(1) PULEJ ($002E) PULEJ[7:0] Disabled RDRIV ($000D) RDPJ Full drive}
Port S
Pullup
SP0CR2 ($00D1) PUPS Enabled SP0CR2 ($00D1) RDS Full drive
Port T
Pullup
TMSK2 ($008D) PUPT Enabled TMSK2 ($008D) RDPT Full drive
Port AD
None
—
—
BKGD
Pullup
—
—
Enabled
—
— Full drive
1. Pullup or pulldown devices for each port J pin can be selected with the PUPSJ register ($002D). After reset, pulldowns are
selected for all port J pins but must be enabled with PULEJ register.
Advance Information
MOTOROLA
General Description
MC68HC812A4 — Rev. 3.0
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