UPD72042BGT NEC [NEC], UPD72042BGT Datasheet - Page 28

• Manufacturer Part Number: UPD72042BGT
• Description: LSI DEVICE FOR Inter Equipment Bus (IEBus) PROTOCOL CONTROL
• Manufacturer: NEC [NEC]

3.4 STANDBY MODE SETTING AND CANCELLATION
and the impedance of the XO pin goes high.
3.5 RESET MODE SETTING AND CANCELLATION
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Standby mode can be set by setting STREQ of the CTR register to 1. The XI pin for oscillation is tied to GND,
In standby mode (with the STM flag of the FLG register set to 1), only the following registers can be accessed:
Writable register
Readable register : FLG (address 0001B)
Standby mode can be cancelled by setting STREQ of the CTR register to 0.
Caution Do not read any data from internal registers via the serial I/O during the period from when a
For hardware reset, the registers are initialized and standby mode is set. (During this period, oscillation is stopped.)
For software reset, the registers are initialized, and operation is started.
microcomputer sets the STREQ flag to 1 to when the PD72042B enters the standby mode. This
period is one-communication frame at maximum.
: CTR (address 0000B)
Data Sheet S13990EJ3V0DS
PD72042B